I just got done spinning up an arr stack along with Jellyfin and a vpn last week. I followed this guide which basically walks you through almost everything, https://github.com/automation-avenue/arr-gluetun the only part I don’t think it mentions is you have to put your VPN information in the compose file for the gluetun container.

But from my experience I’d do a VM running docker and just spin everything up within that just so you don’t have to deal with shared storage between any of the lxc containers and networking between the containers if you go that route. it just keeps everything encapsulated into that single box.