I just purchased a cheapo 3 light vanity fixture from a big box store to replace a 2 light fixture in a bathroom. Our bathroom has a bit of an overhang down from the ceiling where the fixture was mounted. So I was expecting to just zip this fixture in, but looking at the instructions, I saw that it says "Wall Mount Only" - Well technically I'm not putting it in the ceiling of the room, I'm putting it on the overhang, but it will be hanging horizontally, not vertically. Is there any issue with this? What exactly does the "Wall Mount Only" mean?