Free VPN for OpenMediaVault??

Sonarr would be perfect for you, as would be the dynor/qbittorrent docker.

Im using https://tailscale.com/ which is pretty awesome! you could take a look at it

Install the PPTP VPN plugin on OpenMediaVault. Then create a VPN account with a provider that supports PPTP VPN. Follow the provider's instructions for setting up the PPTP VPN connection.

ProtonVPN has a free tier that supports openvpn as well as wireguard. StackSocial runs promos for various VPN services that have "lifetime" subscriptions. But be aware it is their lifetime that it seams to be.