Synologie expressvpn
Synology never reply to requests for help on setup, and their vpn client software can't be easily tied to specific applications, is a royal pita to set up properly, and is prone to frequent disconnects and failed reconnects under load. Openvpn in particular barely works at all for me. There's some stuff you can do under the hood with iptables, but really is just easier to set up a vpn network