I ended up just buying a cheap universal magnet vent mount kit, and a cheap clear iPhone case with a metal piece built into the center of the back with a kickstand ring on it. Seems like they mate pretty securely. Still waiting for the actual phone.
How did this work for you?
I still have this small magnet in my car, but I had a plate between my case and my old XS Max phone. That was a strong connection. The 12 ProMax with a Magsafe case...the connection is just weak. I would try the plate but I was getting some QI charging issues. (Guessing the plate was overlapping the circle magsafe?)
About 3/4 in wide I guess.
I see 3, 4 dollar magnets at HomeDepot, I'd just slap this 2in diameter in my car, perfect size for the Pro Max Ring...but these are VERY strong magnets!
Maybe thinking too much, the one thing I can picture, fear is connecting the phone,MagSafe case to the magnet (Options - "Strong enough to pull 10, 20, 25lbs") and literally ripping apart the insides of the iPhone.