This is a well-made unit.  Unlike some other Wayfair "white" shelves, this item is COMPLETELY covered in a white melamine veneer over a strong engineered "wood" product.  Not sprayed white like a lot of other shelves.  I'm thinking strong because the metal threaded fittings are anchored firmly and receive the well-torqued attachment bolts without stripping or pulling out.  Everything squares up simply by tightening the bolts - no finessing required.  Mounting to the walls involves four screws directly to the wall. they're covered by sticky discs that are hardly visible.  Much easier than lining up hidden keyhole plates in the rear.