I'm not a big "pedals on the floor" guy but in my setup I do use a few in my chain which get turned on and left on. In the past I've piled them on top of my amp but always had issues with them sliding off. Sometimes they got taped, sometimes, velcro, etc. Either way it was a pain, less than effective and typically left a sticky mess behind. I was thinking about using painters tape (no sticky mess!) to add magnets to the bottom of the pedals and the top of the rack-mounted head. Since were dealing with electronics and magnets I wanted to run this by the folks here to see if there is something that I might be overlooking that could cause damage or an issue. The magnets are small "rare earth" type. I've been using them to make stir plates (I homebrew beer). What do you folks think? There's enough holding power to keep the pedals and other items from sliding off. But I'm always concerned about causing damage. Thanks!