diff --git a/addons/api/addon/adapters/host-set.js b/addons/api/addon/adapters/host-set.js
index fe35a1935..d237c63d9 100644
--- a/addons/api/addon/adapters/host-set.js
+++ b/addons/api/addon/adapters/host-set.js
@@ -10,7 +10,7 @@ export default class HostSetAdapter extends ApplicationAdapter {
   // =attributes
 
   /**
-   * Host catalogs use the new, unprefixed pathing style.
+   * Host sets use the new, unprefixed pathing style.
    * @override
    */
   hasScopePrefix = false;
diff --git a/addons/api/addon/adapters/host.js b/addons/api/addon/adapters/host.js
index ae1747b06..d6b6ea5eb 100644
--- a/addons/api/addon/adapters/host.js
+++ b/addons/api/addon/adapters/host.js
@@ -7,32 +7,12 @@ export default class HostAdapter extends ApplicationAdapter {
 
   @service store;
 
-  // =methods
+  // =attributes
 
   /**
-   * Append a host catalog URL ahead of the host path if `hostCatalogID` is
-   * passed via adapter options.  Otherwise, generate the prefix as normal.
-   *
-   * TODO:  generalize the interface to resource-prefixed URLs by accepting
-   *        a modelName and an ID, rather than looking for a known key.
-   *
+   * Hosts use the new, unprefixed pathing style.
    * @override
-   * @param {string} path
-   * @param {string} parentURL
-   * @param {string} modelName
-   * @param {string} id
-   * @param {object} snapshot
-   * @return {string} urlPrefix
    */
-  urlPrefix(path, parentURL, modelName, id, snapshot) {
-    const hostCatalogID = snapshot?.adapterOptions?.hostCatalogID;
-    if (hostCatalogID) {
-      const hostCatalogAdapter = this.store.adapterFor('host-catalog');
-      return hostCatalogAdapter
-        ._buildPrefixedURL('host-catalog', hostCatalogID, snapshot);
-    } else {
-      return super.urlPrefix(...arguments);
-    }
-  }
+  hasScopePrefix = false;
 
 }
diff --git a/addons/api/addon/generated/models/host-set.js b/addons/api/addon/generated/models/host-set.js
index d1af3fe32..309165055 100644
--- a/addons/api/addon/generated/models/host-set.js
+++ b/addons/api/addon/generated/models/host-set.js
@@ -15,7 +15,6 @@ export default class GeneratedHostSetModel extends BaseModel {
 
   @attr('string', {
     description: 'The owning host catalog ID.',
-    readOnly: true
   }) host_catalog_id;
 
   @attr('string', {
diff --git a/addons/api/addon/generated/models/host.js b/addons/api/addon/generated/models/host.js
index 8713b9b89..50f1463e0 100644
--- a/addons/api/addon/generated/models/host.js
+++ b/addons/api/addon/generated/models/host.js
@@ -12,6 +12,10 @@ export default class GeneratedHostModel extends BaseModel {
     description: 'The type of the resource, to help differentiate schemas'
   }) type;
 
+  @attr('string', {
+    description: 'The owning host catalog ID.',
+  }) host_catalog_id;
+
   @attr('string', {
     description: 'Optional name for identification purposes'
   }) name;
diff --git a/addons/api/addon/models/host-set.js b/addons/api/addon/models/host-set.js
index c4b93e905..ffa0f7906 100644
--- a/addons/api/addon/models/host-set.js
+++ b/addons/api/addon/models/host-set.js
@@ -1,6 +1,5 @@
 import GeneratedHostSetModel from '../generated/models/host-set';
 import { fragmentArray } from 'ember-data-model-fragments/attributes';
-//import { computed } from '@ember/object';
 
 export default class HostSetModel extends GeneratedHostSetModel {
 
@@ -12,18 +11,6 @@ export default class HostSetModel extends GeneratedHostSetModel {
    */
   @fragmentArray('fragment-string', {readOnly: true}) host_ids;
 
-  // TODO this is here in case we want it in the future,
-  // especially for the target / add host sets workflow
-  /**
-   * Returns the host catalog instance associated with this host set if
-   * it is already loaded into the store.
-   * @type {?HostCatalogModel}
-   */
-  // @computed('host_catalog_id')
-  // get hostCatalog() {
-  //   return this.store.peekRecord('host-catalog', this.host_catalog_id);
-  // }
-
   // =methods
 
   /**
diff --git a/addons/api/addon/serializers/host.js b/addons/api/addon/serializers/host.js
new file mode 100644
index 000000000..06a7b91d3
--- /dev/null
+++ b/addons/api/addon/serializers/host.js
@@ -0,0 +1,13 @@
+import ApplicationSerializer from './application';
+
+export default class HostSerializer extends ApplicationSerializer {
+
+  // =attributes
+
+  /**
+   * Serialized the scope ID into the `scope_id` field.
+   * @type {boolean}
+   */
+  serializeScopeID = true;
+
+}
diff --git a/addons/api/app/serializers/host.js b/addons/api/app/serializers/host.js
new file mode 100644
index 000000000..33844fbaf
--- /dev/null
+++ b/addons/api/app/serializers/host.js
@@ -0,0 +1 @@
+export { default } from 'api/serializers/host';
diff --git a/addons/api/tests/unit/adapters/host-test.js b/addons/api/tests/unit/adapters/host-test.js
index 1e557ad26..1e45bbee7 100644
--- a/addons/api/tests/unit/adapters/host-test.js
+++ b/addons/api/tests/unit/adapters/host-test.js
@@ -4,25 +4,9 @@ import { setupTest } from 'ember-qunit';
 module('Unit | Adapter | host', function(hooks) {
   setupTest(hooks);
 
-  test('it generates correct complete URLs', function (assert) {
-    assert.expect(2);
-    const scopeID = 'o_1';
-    const hostCatalogID = 'hc_098';
-    const method = 'my-custom-method';
-    const mockSnapshot = {
-      adapterOptions: {
-        scopeID,
-        method
-      }
-    };
-    const adapter = this.owner.lookup('adapter:host');
-    // Without hostCatalogID...
-    let url = adapter.buildURL('host', null, mockSnapshot, 'findAll');
-    assert.equal(url, '/v1/scopes/o_1/hosts:my-custom-method');
-    // With hostCatalogID...
-    mockSnapshot.adapterOptions.hostCatalogID = hostCatalogID;
-    url = adapter.buildURL('host', null, mockSnapshot, 'findAll');
-    assert.equal(url, '/v1/host-catalogs/hc_098/hosts:my-custom-method');
+  test('it exists', function(assert) {
+    let adapter = this.owner.lookup('adapter:host');
+    assert.ok(adapter);
   });
 
 });
diff --git a/addons/api/tests/unit/serializers/host-set-test.js b/addons/api/tests/unit/serializers/host-set-test.js
index 595c6f771..c10cbe915 100644
--- a/addons/api/tests/unit/serializers/host-set-test.js
+++ b/addons/api/tests/unit/serializers/host-set-test.js
@@ -11,6 +11,7 @@ module('Unit | Serializer | host set', function(hooks) {
     const record = store.createRecord('host-set', {
       name: 'Host Set 1',
       description: 'Description',
+      host_catalog_id: '123',
       version: 1
     });
     const snapshot = record._createSnapshot();
@@ -19,6 +20,7 @@ module('Unit | Serializer | host set', function(hooks) {
     assert.deepEqual(serializedRecord, {
       name: 'Host Set 1',
       description: 'Description',
+      host_catalog_id: '123',
       version: 1
     });
   });
diff --git a/addons/api/tests/unit/serializers/host-test.js b/addons/api/tests/unit/serializers/host-test.js
new file mode 100644
index 000000000..c31a5ce4e
--- /dev/null
+++ b/addons/api/tests/unit/serializers/host-test.js
@@ -0,0 +1,23 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+
+module('Unit | Serializer | host', function(hooks) {
+  setupTest(hooks);
+
+  // Replace this with your real tests.
+  test('it exists', function(assert) {
+    let store = this.owner.lookup('service:store');
+    let serializer = store.serializerFor('host');
+
+    assert.ok(serializer);
+  });
+
+  test('it serializes records', function(assert) {
+    let store = this.owner.lookup('service:store');
+    let record = store.createRecord('host', {});
+
+    let serializedRecord = record.serialize();
+
+    assert.ok(serializedRecord);
+  });
+});
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets.js
index 045a0f632..3d2ec03bc 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets.js
@@ -14,8 +14,7 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostSetsRo
    * Loads all host-sets under the current host catalog and it's parent scope.
    * @return {Promise{[HostSetModel]}}
    */
-  async model() {
-    this.store.unloadAll('host-set');
+  model() {
     const { id: host_catalog_id } =
       this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog');
     return this.store.query('host-set', { host_catalog_id });
@@ -44,10 +43,11 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostSetsRo
     try {
       const { isNew } = hostSet;
       await hostSet.save();
+      await this.transitionTo('scopes.scope.projects.project.host-catalogs.host-catalog.host-sets.host-set', hostSet);
+      await this.refresh();
       this.notify.success(
         this.intl.t(isNew ? 'notify.create-success' : 'notify.save-success')
       );
-      this.transitionTo('scopes.scope.projects.project.host-catalogs.host-catalog.host-sets.host-set', hostSet);
     } catch (error) {
       // TODO: replace with translated strings
       this.notify.error(error.message, { closeAfter: null });
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/add-hosts.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/add-hosts.js
index b7ef1afd2..d4a301f93 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/add-hosts.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/add-hosts.js
@@ -24,11 +24,10 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostSetsHo
    * @return {Promise{HostSetModel,[HostModel]}}
    */
   async model() {
-    const scopeID = this.modelFor('scopes.scope.projects.project').id;
-    const hostCatalogID = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog').id;
+    const { id: host_catalog_id } = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog');
     return hash({
       hostSet: this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog.host-sets.host-set'),
-      hosts: this.store.findAll('host', { adapterOptions: { scopeID, hostCatalogID } })
+      hosts: this.store.query('host', { host_catalog_id })
     });
   }
 
@@ -84,13 +83,11 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostSetsHo
   @action
   async addHosts(hostSet, hostIDs) {
     try {
-      const scopeID = this.modelFor('scopes.scope.projects.project').id;
-      const hostCatalogID = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog').id;
-      await hostSet.addHosts(hostIDs, { adapterOptions : { scopeID, hostCatalogID } });
+      await hostSet.addHosts(hostIDs);
+      await this.replaceWith('scopes.scope.projects.project.host-catalogs.host-catalog.host-sets.host-set.hosts');
       this.notify.success(
         this.intl.t('notify.save-success')
       );
-      this.replaceWith('scopes.scope.projects.project.host-catalogs.host-catalog.host-sets.host-set.hosts');
     } catch (error) {
       // TODO: replace with translated strings
       this.notify.error(error.message, { closeAfter: null });
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/hosts.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/hosts.js
index f349d0c72..7ae488994 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/hosts.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/host-set/hosts.js
@@ -12,25 +12,16 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostSetsHo
 
   // =methods
 
-  /**
-   * Empty out any previously loaded hosts.
-   */
-  beforeModel() {
-    this.store.unloadAll('host');
-  }
-
   /**
    * Loads all hosts under the current host set.
    * @return {Promise{HostSetModel,[HostModel]}}
    */
   async model() {
-    const scopeID = this.modelFor('scopes.scope.projects.project').id;
-    const hostCatalogID = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog').id;
     const hostSet = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog.host-sets.host-set');
     return hash({
       hostSet,
       hosts: all(hostSet.host_ids.map(host =>
-        this.store.findRecord('host', host.value, { adapterOptions: { scopeID, hostCatalogID } })
+        this.store.findRecord('host', host.value, { reload: true })
       ))
     });
   }
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/new.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/new.js
index f0dbcc3bd..378b78c7a 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/new.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/host-sets/new.js
@@ -9,10 +9,11 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostSetsNe
    * @return {HostSetModel}
    */
   model() {
-    const scopeModel = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog');
+    const { id: host_catalog_id } =
+      this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog');
     return this.store.createRecord('host-set', {
       type: 'static',
-      scopeModel
+      host_catalog_id
     });
   }
 
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts.js
index 805112d67..d8bfcfddc 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts.js
@@ -14,8 +14,10 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostsRoute
    * Loads all hosts under the current host catalog and it's parent project scope.
    * @return {Promise{[HostModel]}}
    */
-  async model() {
-    return this.store.findAll('host', this.adapterOptions());
+  model() {
+    const { id: host_catalog_id } =
+      this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog');
+    return this.store.query('host', { host_catalog_id });
   }
 
   // =actions
@@ -40,12 +42,12 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostsRoute
   async save(host) {
     try {
       const { isNew } = host;
-      await host.save(this.adapterOptions());
-      this.refresh();
+      await host.save();
+      await this.transitionTo('scopes.scope.projects.project.host-catalogs.host-catalog.hosts.host', host);
+      await this.refresh();
       this.notify.success(
         this.intl.t(isNew ? 'notify.create-success' : 'notify.save-success')
       );
-      this.transitionTo('scopes.scope.projects.project.host-catalogs.host-catalog.hosts.host', host);
     } catch (error) {
       // TODO: replace with translated strings
       this.notify.error(error.message, { closeAfter: null });
@@ -59,7 +61,7 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostsRoute
   @action
   async delete(host) {
     try {
-      await host.destroyRecord(this.adapterOptions());
+      await host.destroyRecord();
       this.refresh();
       this.notify.success(this.intl.t('notify.delete-success'));
       this.transitionTo('scopes.scope.projects.project.host-catalogs.host-catalog.hosts');
@@ -68,14 +70,4 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostsRoute
       this.notify.error(error.message, { closeAfter: null });
     }
   }
-
-  /**
-   * Configure adapter options using current host catalog scope and it's parent project scope.
-   * @return {object}
-   */
-  adapterOptions() {
-    const scopeID = this.modelFor('scopes.scope.projects.project').id;
-    const hostCatalogID = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog').id;
-    return { adapterOptions : { scopeID, hostCatalogID } };
-  }
 }
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/host.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/host.js
index 87525e6c8..2561da8d6 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/host.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/host.js
@@ -10,12 +10,7 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostsHostR
    * @return {HostModel}
    */
   async model({ host_id }) {
-    const { id: scopeID } = this.modelFor('scopes.scope.projects.project');
-    const hostCatalogID = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog').id;
-    return this.store.findRecord('host', host_id, {
-      reload: true,
-      adapterOptions: { scopeID, hostCatalogID }
-    });
+    return this.store.findRecord('host', host_id, { reload: true });
   }
 
   /**
diff --git a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/new.js b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/new.js
index 39f90d1bb..d8234bc47 100644
--- a/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/new.js
+++ b/ui/core/app/routes/scopes/scope/projects/project/host-catalogs/host-catalog/hosts/new.js
@@ -9,10 +9,11 @@ export default class ScopesScopeProjectsProjectHostCatalogsHostCatalogHostsNewRo
    * @return {HostModel}
    */
   model() {
-    const scopeModel = this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog');
+    const { id: host_catalog_id } =
+      this.modelFor('scopes.scope.projects.project.host-catalogs.host-catalog');
     return this.store.createRecord('host', {
       type: 'static',
-      scopeModel
+      host_catalog_id
     });
   }
 
diff --git a/ui/core/mirage/config.js b/ui/core/mirage/config.js
index 7c7a1fdf8..754e5a880 100644
--- a/ui/core/mirage/config.js
+++ b/ui/core/mirage/config.js
@@ -157,24 +157,30 @@ export default function() {
 
   // host
 
-  this.get('/host-catalogs/:hostCatalogId/hosts', function ({ hosts }, { params: { hostCatalogId } }) {
+  this.get('/hosts', function ({ hosts }, { queryParams: { host_catalog_id: hostCatalogId } }) {
     return hosts.where({ hostCatalogId });
   });
-  this.post('/host-catalogs/:hostCatalogId/hosts', function ({ hosts }, { params: { hostCatalogId } }) {
+  this.post('/hosts', function ({ hostCatalogs, hosts }) {
     const attrs = this.normalizedRequestAttrs();
-    attrs.hostCatalogId = hostCatalogId;
+    const hostCatalog = hostCatalogs.find(attrs.hostCatalogId);
+    attrs.scopeId = hostCatalog.scope.id;
     return hosts.create(attrs);
   });
-  this.get('/host-catalogs/:hostCatalogId/hosts/:id');
-  this.patch('/host-catalogs/:hostCatalogId/hosts/:id');
-  this.del('/host-catalogs/:hostCatalogId/hosts/:id');
+  this.get('/hosts/:id');
+  this.patch('/hosts/:id');
+  this.del('/hosts/:id');
 
   // host-set
 
   this.get('/host-sets', function ({ hostSets }, { queryParams: { host_catalog_id: hostCatalogId } }) {
     return hostSets.where({ hostCatalogId });
   });
-  this.post('/host-sets');
+  this.post('/host-sets', function ({ hostCatalogs, hostSets }) {
+    const attrs = this.normalizedRequestAttrs();
+    const hostCatalog = hostCatalogs.find(attrs.hostCatalogId);
+    attrs.scopeId = hostCatalog.scope.id;
+    return hostSets.create(attrs);
+  });
   this.get('/host-sets/:id');
   this.patch('/host-sets/:id');
   this.del('/host-sets/:id');
diff --git a/ui/core/mirage/factories/host-catalog.js b/ui/core/mirage/factories/host-catalog.js
index f2541fcb7..1eaed0433 100644
--- a/ui/core/mirage/factories/host-catalog.js
+++ b/ui/core/mirage/factories/host-catalog.js
@@ -6,8 +6,7 @@ export default factory.extend({
   withChildren: trait({
     afterCreate(hostCatalog, server) {
       const { scope } = hostCatalog;
-      const scopePojo = { id: scope.id, type: scope.type };
-      const hosts = server.createList('host', 10, { scope: scopePojo, hostCatalog });
+      const hosts = server.createList('host', 10, { scope, hostCatalog });
       server.createList('host-set', 3, { scope, hostCatalog, hosts });
     }
   })
diff --git a/ui/core/mirage/models/host.js b/ui/core/mirage/models/host.js
index 89aba81e6..b9a941a4f 100644
--- a/ui/core/mirage/models/host.js
+++ b/ui/core/mirage/models/host.js
@@ -2,6 +2,7 @@ import { Model, belongsTo } from 'ember-cli-mirage';
 
 export default Model.extend({
 
+  scope: belongsTo(),
   hostCatalog: belongsTo()
 
 });
diff --git a/ui/core/mirage/serializers/host.js b/ui/core/mirage/serializers/host.js
index ccd3994ca..4fb0353b4 100644
--- a/ui/core/mirage/serializers/host.js
+++ b/ui/core/mirage/serializers/host.js
@@ -1,5 +1,22 @@
 import ApplicationSerializer from './application';
+import { underscore } from '@ember/string';
 
 export default ApplicationSerializer.extend({
-  modelName: 'host'
+  modelName: 'host',
+
+  keyForRelationshipId(relationshipName) {
+    return `${this._container.inflector.singularize(
+      underscore(relationshipName)
+    )}_id`;
+  },
+
+  _hashForModel(model) {
+    const json = ApplicationSerializer.prototype._hashForModel.apply(this, arguments);
+    json.scope = {
+      id: model.scope.id,
+      type: model.scope.type
+    };
+    return json;
+  }
+
 });