I’ve got a lot of clamps, but they don’t take up much space. I simply drilled 5/8-in.-dia. holes through 3/4-in. plywood at a slight upward angle and glued in 9-in.-long 5/8-in.-dia. dowels. Each pair of dowels holds six clamps, so I can hang 18 adjustable clamps and four spring clamps in only 2 square ft. of wall space.