The charger main connector will be mounted to the rear of the IMA box.
Mount the stick on drill template to the IMA box at the desired location, Have someone press against the opposite side of the box with a heavy backup block so the punches are deep and distinct.
Drill the 4 screw holes, then the center where the 7/8 hole will be. Enlarge the center hole to 7/8" with the step drill, deburr and you are ready to mount bulkhead connector.
If a more accessible connector is desired, extension cables will be available, that will allow a duplicate bulkhead connector to be installed on the top of the small shelf as shown in the next photos.