HELP - Projector issues

Hi

So I have some room size limitations that are impacting my selection of projectors.

Essentially I have screen size of 108 inches wide by 81 high (for a 4.3 ratio) Given room size it appears that I use a short throw projector but here is the kicker I want to be hitting from between 7 to 8 feet from the screen. So unless I am missing something and that is possible I am looking for a projector that has a throw of between 7 to 8 feet.

So what are my mounting options.

Ceiling Directly overhead...? slightly offset?

Has anyone done a floor mount... that would offer me more options with throw distance - all the models I am looking at have at least 20 percent vertical keystoning

Thoughts????