Right, the APIs in question (and thus the Ansible modules and playbooks) focus on the day-to-day operations, not the initial installation/configuration.
For virtual gateway instances, we can do some automated deployment of gateways using the various mechanisms provided by the cloud.
For physical gateways, there are ways to automate the deployment (blink images, CDT, etc) but not via Ansible.
The initial deployment of management can be partially automated like gateways, but the need to deploy management in an automated fashion is typically far less.