Add support for Redmi AX6 AX3000 Wi-Fi 6 Mesh Router

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@dorihoile

I also wanted to know if, in theory, it is possible to have a VPN on a router and only have it affect certain devices on the network and have other be routed through normally

It is possible.
You need to do Policy Based Routing and you have 3 options:

1. mwan3 package
2. pbr package
3. a set of rules/routes for each internet connection.

Regarding the compatibility, I am not aware if there are any similarities with supported devices, but that would make things easier.