Small size, up to size 39 to fit everything, otherwise if you don't mind the shoe protruding it's okay. The use of the "hinge" it has is simple but quite cumbersome, so once you adjust it to the desired height, leave it there.

If you have 3 pairs, you need at most 2, generally shoes-1= maximum recommended number of the product. It makes sense to use it inside a shoe cabinet, with sufficient height between the shelves. The mechanism is not what I expected, it requires force, it is strange and will confuse you at first.