The Rokform vent mount had a great magnetic hold and it feels like it will keep my iPhone in place while I drive.

Strong grip! And didn’t even move the vent 👍🏻

Dual Magnet Vent Mount

This mount is AWESOME! No slipping, no falling on the floor board. Keeps my phone right there even over the roughest terrain. I couldn't recommend this more highly. If you're tired of losing your phone because of weak magnet holders, this is the vent mount for you!