Magnetic Phone Holder (GoPro attach)

Hi,

I looked for a magnetic phone holder like those who are on a car (eg. https://www.amazon.fr/Magn%C3%A9tique-da%C3%A9ration-T%C3%A9l%C3%A9phone-Universel-Smartphones/dp/B00Z9PVOJM/).

I use the following magnet : https://www.amazon.fr/n%C3%A9odyme-diam%C3%A8tre-d%C3%A9paisseur-Traction-Magenesis%C2%AE/dp/B06X977K8L/

Place the magnet, glue the 2 parts, wait and that's it.

I share all the file (I used Fusion360 and Tinkercad).

The support may slip and I think I need something to g