How do you get it up there? A super long extension cord?? IN a school full of cinderblock walls, I'll try anything. What I use now is the 3M double stick tape, the kind that is foam and you peel off the green backing, stick to the piece, then peel again when you want to stick it to the wall. Works great, but never comes off. After 3 years in the school, there are bits of tape everywhere (luckily, they don't ever complain. The custodians scrape most of it off)