This is easy. I used the part of the case I don’t use, drilled some holes (one for the lens and two for the screw), a screw and locking nut.
The rear view mirror cover comes off with a slight slide to you and then down.
My phone snaps in or slide the cover off and do it.
Works for me...
I'm looking to run hardwired USB power up to the mirror area - not a cable hanging, but an actual port. Has anyone done it? I'm having trouble finding a spot up there or a part to do it with. I'm using it for running a hardwired Dashcam AND GoPro.