Ethernet backhaul using other routers
I searched for this and couldn't find anything specific - can you use an AirPort Extreme as a mesh point with an Amplifi HD and ethernet backhaul? I have the last version of an AE-ac lying around and thought I would put it to use.
@hanz-shcaerp AmpliFi will only register other AmpliFi products as mesh points. The AirPort Extreme may have the option to configure to a 3rd party network as an extender, but via ethernet backhaul I am not sure and unfortunately don't have one to test this.