This bracket is installed on the accessory jack under the dashboard. The trapezoid is almost the same shape as the flange and the raised lip lines up to the accessory jack. This allows easy centering and alignment. All you need to do is push the charger through the hole first before removing the adhesive backing.
You need to buy the magnet mount separately from Amazon. The following models are compatible:
You will also need to buy 3M VHB Tape
. This is available in a smaller roll from Auto Parts Stores.