First and foremost they need to have drip loops. None of these do. Water running down an electrical chord right into the outlet is a fire hazard.
You need to have one of these on every one of the plugs into the back of the PC100a, and for the chord of the PC100a into the wall socket.
Can't help with your placement but please keep this in mind when mounting.BMKJ02 I would be very uncomfortable with the way you have your's mounted.