I'm a big believer in Dual Lock and used it on my pedal board. It held so tightly I had to use a screwdriver to break pedals from the board.
I was futzing with my FM9 or FM3+FC6 on a Temple Audio Duo 24 board a while back, and now have three swaths of Dual Lock 250 on either end on the board to accommodate the FM3+FM6, or the FM9, with dual layers of Dual Lock between the feet of the bumpers of the units.
Basically that equates to four layers on each end of the unit, one long enough to fit between the feet of the bumper to the pedalboard, another layer, equally long, mated to it mushroom to mushroom, another layer, again equally long, stuck to the back of it adhesive to adhesive, then another layer the same length mated to it mushroom to mushroom and its back adhesive stuck to the bumper on the unit. So there's four strips of equal length with the two middle layers stuck adhesive to adhesive. That "dual layer" approach has been working for a couple months now.