What if my studs aren't where I want to put my racks?Updated 4 months ago

You can fix rails across the studs at your preferred mounting height and then you can space your racks along the rails. Another option is to fix a sheet of plywood (10-13mm, or 1/2 inch thick) across the top of your wall lining or studs and then screw your racks to the ply in the exact location you want them.