I drilled the hole for my speaker wire, lock actuators, and accent lighting, right though the center of the plug. But it was in my 01 LX. I did the same with my 03 ZTW wagon. The LX wasn't hard as I only had a few wires going to the plug. Now power locks or windows. The wagon which had power everything I had to take alittle extra care. Easiest way to drill them is to remove them from the car. The door side is easy. The car side requires getting into the inner body behind the kick panel.
2013 Focus ST-3, Tuxedo Black " Pugsley" my 6th Focus
2002 USACi SQ world champion builder/owner/competitor
Drag racing is for fast cars, Autocrossing is for fast drivers