What kind of angle do projectors shoot their screen at. I want to use my far wall for my screen but I have a header that runs the length of the room, 5 feet from the far wall, and hangs down 12 inches. The ceiling for the rest of the room is 93" so the header hangs down at 81". I have a picture if someone needs to see it to know what I mean. I am wondering if the header will prevent me from using a projector, I dont know much about them. How far from the floor do you usually put a screen? If I didnt have to put the top of the screen near the ceiling I should be ok, right? Picture included.