Does it support the new iPhone 12/13 and MagSafe?

Yes, the SnapMount 3 is compatible with MagSafe and can hold magnetically even without a phone case. However, please note the SnapMount 3 does not support MagSafe 15W charging, it will support Qi wireless 15W charging. Apple iPhone 12 and 13 will still be limited to 7.5W charging.