Suppose you configured two VPN connections using WireGuard, one to NYC another to Paris. You can only connect to one of them at a time. If you want to switch from NYC to Paris, then you need to log in and start the Paris connection, and the NYC connection will automatically stop.
However, you can have one active connection per VPN protocol. Thus you can have up to three VPN connections concurrently, each using a different protocol. And if you tie these connections to different VLANs, you can effectively switch from one to another by connecting to a different SSID.