What is the best way to use the metal plates included with my magnetic mount holder?

Phone with a case: Place the plate in-between the case and your phone.
Phone with a thick case: Stick the plate to the pack of the case.
Phone without a case: Stick the plate to the back of the phone.
NOTE: For Smartphone's equipped with wireless charging, we recommend placing the metal place on the lower half of the phone so that it does not interfere with the charging coil.