After remodeling our bathroom, I did not want to drill holes in the new tiles, nor have towel bars visible in an open concept room.  I tried behind the door "hinge bars", but were not adequate.  On reviews of others, I decided to try this piece, and it is a winner !  I did not attach the white tray to the bottom, so you can use it either way.  It has weighted bars that go in side the bottom bars that sit on the floor, so the unit does not tip over.  Very easy to put together, and feels sturdy with 2 large towels draped over the bars.