I have the Openvpn-as docker installed on my unRAID server and my iPad set up with the openVPN client configured with a connection profile to the unRAID server.    If I want to use ControlR away from home I simple start the openVPn client on my iPad (which only takes a few seconds) to open the VPN connection to my unRAID server, and then launch ControlR which now functions exactly as it does when my iPad is connected to my local LAN.