Here's my future option.... (idea)...
Drop a dirty big 1"1/4 inch hole right through the board, and insert a 1" (N.B.) PVC Conduit, and fibreglass the conduit into the board. Then use a fat motorbike cable lock, loop that through the board (through the conduit hole !), and loop around the racks !

(NB is Nominal Bore, or ID / Internal Diameter, for non pipe people

. OD is outside diameter).