In one embodiment of the present disclosure, an attachment assembly for coupling to a base plate includes a substantially planar attachment plate having a top side and a bottom side, a magnet assembly including at least three magnets, each of the at least three magnets having a first side and a second side opposite the first side, the first sides of the at least three magnets are configured for coupling with the bottom side of the attachment plate, wherein the at least three magnets each have a first end and a second end, such that the first end of each magnet is adjacent a second end of an adjacent magnet to form an array, and a shim plate removably coupled to the second side of the at least three magnets.