I am trying to decide on my first proj. purchase, bit I need help with a couple questions first. My finished ceiling height is only 6'8" tall. I want to wall mount a 16:9 screen all the way up to ceiling if possible. I don't want underside of proj. to be below 6'height, do I need a proj. with lens shift to make this work? I don't want to use keystone correction. That leaves me 8" from ceiling to underside of projector, will it work? I sure could use your advice. Thanks.