Zannej All electrical wiring devices are divided into indoor and outdoor use and these systems are indoor usage. Bathrooms are fine and should be to code and GFCI protected. You don’t need a plug with this stuff. They have extenders and such that bring the current boxes out away from the wall so the channel that holds the wires clips in. the only place you might have to get creative is with your light fixture it mounts to a box and I don’t know if you would want it spaced out or if the back of the fixture has enough depth to cover the box. If it does you might have to cut a notch in the side of the base for the track with a dermal tool or something. You see this stuff a lot in condos where the ceiling is poured floor above and someone wants a ceiling fan or something. I have used it several time for adding a ceiling light off another where I couldn’t get in the ceiling. It was just a thought anyway as you said you can’t open the walls. Above all else get that short fixed if you are getting shocked! Nothing to mess around with.