Phone holder snap in to dashboard, with intergrated magnets. Its prepared for 20 magnets 8mm diameter and 4mm height. I used 2mm height magnets and one by one added them and tried holding power. Withou mobile case, just with metal shet on phone, 20 magnets holds prety strong(one magnet should hold 1kg). Because I use thick phone case i stack two magnets on top of each other and ended up using 40 magnets.

It can be also used just like platform for another holder.