If you want n qubes to have n different exit IP through the VPN, you need n sys-vpn, and assign each vpn qube to each qube.
This is what I’m doing with my VPN qubes, I have the following VPNs:
- sys-vpn-app-ivpn-1
- sys-vpn-app-ivpn-2
- sys-vpn-app-ivpn-3
They are connected to different VPN servers, which give different exit IP.