Take any Peak Design Mobile Everyday case with SlimLink hard mount (up to 16 Pro Max in size), and add:
This prints without supports all as one piece. Orient diagonally on a 256x256 print bed as shown:

The print-in-place, compliant-design SlimLink mechanism is actually rather secure on its own – I recommend PETG. For completeness sake, magnets are recommended – use eight 6x3mm refrigerator magnets. They can be secured in the exposed holes with a tiny dab of CA glue.
The author remixed this model.
Adds video cage and grip to basic geometry of compliant mount