I am having trouble figuring out if the Panasonic PT-900U projector can be placed on a shelf right-side-up near the ceiling. (Ideally with no degradation in image quality.) With my old projector the Panasonic 300U, the projector needed to be placed 3" above the bottom of the screen if right-side-up or 3" below the top of the screen if upside-down in order to keep the image square (without keystone correction.) I am not sure about this newer PT-900U projector. It has some vertical lense shift capability that might allow it to be placed right-side-up toward the top of the screen. (On a shelf on the back wall without the need for extra mounting hardware, for example.) Anybody know?