The mount has an exit port for the barrel connector. The back is open (for microphone & speaker), and the SD slot is accessible. Camera can easily be removed, tested with C110 (C100 should probably work). I tested only the 5° tilted version.
Held on by four 5x6 mm cylindrical magnets. Shorter ones will work, but you'll have to stuff something in the holes to prevent the magnet from sinking in when glueing. The mount is very stable, I'm using it on the underside of an IKEA Trotten shelf to monitor my 3D printer.
Edit: added versions for M3 and M4 screws (should self-tap).
The author marked this model as their own original creation.