I have successfully installed openstack with Autopilot. And now I would like to enable VPNaaS, I find guides around how to do that, but just wondering if its safe for me to start configuring the cloud services manually, or is there a correct way of doing this when deployed with Landscape?
The OpenStack Autopilot has no way to account for these additional unmanaged services. The safest way for you to proceed would be to use the Juju environment backing the Autopilot to deploy them. You would have to take responsibility to manage and maintain the extra services yourself as the Autopilot will not.