Shelf elegance It is possible to use a shelf that is suitable for a balcony fence for a coffee table or table. You can even use both sides of the stairs and place one next to the other. There are many approaches to using ladder racks! Needless to say, the shelves usually come in pairs or larger groups so that it is more accurate to talk about stair racks for the porch. Stair racks are usually made of wood.