My 2021 Axis came with a larger screen than previous models that looks like it was cobbled in place. Also there wa no inside support for the radio box, so every time I hit a bas bump the radio would drop an inch or so down.
So, after trying to find a resolution with Thor warranty service, I epoxied the display in place and braced the radio box with some wire cables. It now holds up ok but it is a jury rig on top of a jury rig.
So I am pretty familiar with how the radio was mounted, or more accurately not mounted. You get to it by removing the black mat, unscrewing a couple of screws and pulling off the plastic cover.
The two pics are before and after installing the cable bracing and the sponge pad- the blue thing to limit bounce. The last pic shows the display. The last pic is upside down- sorry I am struggling to do this with an iPad.
David