Pretty sure I've got everything necessary.

templates/zerotier/0/docker-compose.yml

@@ -0,0 +1,16 @@
+version: "3"
+services:
+  zerotier:
+    container_name: #(Optional) Custom name for the container, rather than a generated default name.
+    image: zerotier/zerotier-containerized:latest
+    cap_add:
+      - NET_ADMIN
+      - SYS_ADMIN
+    command: -d
+    devices:
+      - "/dev/net/tun"
+    network_mode:
+      - "host"
+    restart: unless-stopped
+    volumes:
+      - "${CONFIG_STORAGE}:/var/lib/zerotier-one"

templates/zerotier/0/rancher-compose.yml

@@ -1,15 +1,13 @@
 version: '2'
 catalog:
-  name: # Name of the versioned template of the Catalog Entry
-  version: # Version of the versioned template of the Catalog Entry
-  description: # Description of the versioned template of the Catalog Entry
-  minimum_rancher_version: # The minimum version of Rancher that supports the template, v1.0.1 and 1.0.1 are acceptable inputs
-  maximum_rancher_version: # The maximum version of Rancher that supports the template, v1.0.1 and 1.0.1 are acceptable inputs
-  upgrade_from: # The previous versions that this template can be upgraded from
+  name: "ZeroTier-Containerized" # Name of the versioned template of the Catalog Entry
+  version: "latest" # Version of the versioned template of the Catalog Entry
+  description: "Will fill in description later." # Description of the versioned template of the Catalog Entry
   questions: #Used to request user input for configuration options
-    - variable: # A single word that is used to pair the question and answer.
-      label: # The "question" to be answered.
+    - variable: "CONFIG_STORAGE" # A single word that is used to pair the question and answer.
+      label: "Persistent Config Path" # The "question" to be answered.
       description: | # The description of the question to show the user how to answer the question.
-      default: # (Optional) A default value that will be pre-populated into the UI
-      required: # (Optional) Whether or not an answer is required. By default, it's considered `false`.
-      type: # How the questions are formatted and types of response expected
+        The path to where ZeroTier should hold it's persistent files. Preferrably a local-only location.
+      default: "/var/lib/Storage-Local/zerotier-one" # (Optional) A default value that will be pre-populated into the UI
+      required: false # (Optional) Whether or not an answer is required. By default, it's considered `false`.
+      type: string # How the questions are formatted and types of response expected

templates/zerotier/config.yml

@@ -1,8 +1,8 @@
 name: ZeroTier-Containerized# Name of the Catalog Entry
 description: |
-  # Description of the Catalog Entry
+  Will put in description later. # Description of the Catalog Entry
 version: # Version of the Catalog to be used
 category: Networking # Category to be used for searching catalog entries
 maintainer: WilliamMiceli # The maintainer of the catalog entry
-license: # The license
+# license: # The license
 projectURL: https://zerotier.com # A URL related to the catalog entry