how to build a site to site network with two ar750s for lan game play with an xbox 360 or computers?
you could use something like zerotier to create a software defined network between devices.
You can set up on as WireGuard Server, and another acts as WireGuard Client. When the connection is established, there is no additional configuration is required, you can access the Server’s LAN by default.
I have a ar300m and a ar750s would this work? both are running v3
Yup, it can work, but the server side must have a public IP address. You can have a try.