I have a ceiling that starts from a standard height and goes up diagonally up to the height of the roof. I have currently got the screen the correct distance from the projector but this is still about 600mm above standard ceiling height. This means I have to have the projector very low on a shelf (which has no image shift) and tilt it correcting the image using keystone.
I would like to mount the projector high upside down but the screen would need to drop more. It can't look naff as the missus would shoot me