LACK Wall shelf unit, WhiteA tight space or an unused wall? This shelf almost always fits. You can also choose to hang it vertically or horizontally depending on space and storage needs. Shallow shelves help you to use the walls in your home efficiently. They hold a lot of things without taking up much space in the room. Choose if you want to mount the shelf horizontally or vertically on the wall. When the wall shelf unit is hung in a horizontal position the total max. load is