Which wall fastenings for twin slot shelving?

Twin Slot Shelving Systems 2 slot shelving ALIJA® Twin Slot Channel Adjustable Rack with 2 Wooden Shelf Shelving Unit Multipurpose RackWall Mount Shelf Rack 24th slot wallet Twin Slot Uprights, Twin Slot U Brackets and Shelf Boards available now

24 slot White Twin Slot Shelving Kit with 2 uprights, 2 shelves and 4 brackets Ideal for storing tools and DIY equipment in the garage or shed