It is possible to charge an iPhone below if it is not equipped with MagSafe. MagSafe does not work

The Apple Watch surface only works with the Apple Watch due to the smaller coil. The other two coils are the same size and you can charge Iphones on the top one (for the Iphone) and on the bottom one (for the Airpods). So yes, you can charge 2 Iphones at the same time, I have just tried this and it works :) Please note, however, that the lower coil (for Airpods) does not support Mag-Safe, but this is not necessary as the iPhone is lying on it. Please also note that the charging speed is reduced the more devices are charged at the same time.

Unfortunately not. The Boost Charge Pro 3-in-1 Qi2 charger is specially designed to work with MagSafe compatible iPhones, including the 16 pro. This means it relies on your iPhone's magnets to align it correctly for optimum charging. Although it has a flat surface, it is not designed for general Qi charging like older iPhones or Android devices.

The iPhone is charged on the bottom surface. At the top right, only the Apple Watch is charged.