I use these in the air vent, very minimal and holds nicely, even off-roading.

Magnetic Phone Holder for Car, WixGear [2 Pack] Universal Air Vent Magnetic Phone Mount for Car, Car Phone Holder Mount for Cell Phones and Mini Tablets with 4 Metal Plates https://www.amazon.com/dp/B01G0X56YU/ref=cm_sw_r_cp_api_i_2GFG71EDNAZKNMZR0GX8

I use one of these:

https://www.amazon.com/Magnetic-WizGear-Universal-Swift-Snap-Technology/dp/B01G0X56YU/

They could be very cheap from time to time and I remember I got mine like $3 each (I have 4 of them in my car).