I'm assuming you're either talking about an outside door, or inside using a 2nd story open floorplan? (basically the 2nd floor is missing so it looks like you have high ceilings)
I'll do my best to try and help. If you're trying to place it on the 2nd floor try going into custom mode, placing a floor tile on the 2nd floor where you want the head to be, and a few extra spots for you to walk around on and a teleporter to get up and down. Now go to the 2nd floor, place the head where you want it. (you can use goza's to raise it higher than normal if you want) Once it is hung up, go back into customize mode and delete the floor tiles you used to place the head. I don't think the head should re-deed when you go into customize mode, but just to be safe, try locking it down before you customize. I would test this out myself, but I'm at work and can't get on UO right now.