The Epson Home Cinema 750HD was designed to be easily setup. It seems Epson was thinking that this projector was so portable that you might want to use it in lots of different places. Not to say you can't permanently mount it and leave it alone, but you are going to find that you will want to bring it places. And with all the setup features, Epson has designed the projector with this in mind.
To start, it has three adjustable feet. You can raise and lower the back of the projector with screw in feet and you can raise the projector in the front very easily. To make it even more convenient to setup, you can also adjust the angle of the projector with a slider near the lens. So, even if the projector sits a little off angle, you can adjust for that and square the image. As with all projectors with this feature, it does reduce image quality. You can expect a drop in sharpness. Same goes with using keystone correction to get a nice square image. Both distort the clarity of the image. As mentioned this is across all projectors, not just Epson projectors.