I put two of these on my Leggett & Platt adjustable bed which has only gliders under the frame. One on the Head riser and the other on the foot riser. My mattress was only 10 inches off the floor so the rail would contact the floor before folding down. I raised the pivot point 4 inches and moved the cross bar under the mattress closer to the pivot point to avoid the vibrator pads. since I located them so one of the L shapped tube was over the vibrator pad, I cut 4-1/4 inches off the end. They work fine now.