I decided to make a phone mount based off of the card slot which I find useless. I went to Dollar tree and got a phone holder that mounts to the air vent, and a cutting board. The cutting board is the perfect thickness to fit in securely. Using your tool of choice (Dremel, cut off wheel, bench grinder if necessary) cut out a section sized to a credit card with a 3" arm off the side. I wanted mine to sit a bit lower but it will totally work without my additions. Links included.
https://www.dollartree.com/home-collection-paddle-cutting-boards/178253
https://www.dollartree.com/e-circuit-auto-cell-phone-holders/243892
https://www.dollartree.com/home-collection-paddle-cutting-boards/178253
https://www.dollartree.com/e-circuit-auto-cell-phone-holders/243892