It is not hard to mount the strips permanently. It just takes 3 screws. You shoot in two that match the keyhole slots, pulled up so you get a snug fit with the case and shoot a 3d one in at the top, right above the strip, close enough so it won't slide up and come out of the keyhole slots.
We had a guy in my office who was a master at it and they were everywhere until the fire marshal started tagging them.
He even had a template to measure the pilot holes for the screws. The "hero" of the secretarial pool. ;-)

For the most part it was just radios, fans, wall warts and the occasional desk lamp plugged in. The problem came when they plugged in a space heater.


Greg Fretwell