Hi x94blair3,
Putting it above and angled down is likely preferable to putting it below, although if you can keep it well away from the floor below the screen, you'll be fine. (The floor may introduce boundary effects and floor bounce if there is no rug or carpet.)
Another approach that works very well was used by Axiom founder and designer, Ian Colquhoun. He used two VP-150s, one bracket-mounted (with the Axiom FMB) above the screen and one also bracket-mounted below it. That way, for viewers, it images in the center of the screen, but of course you have to use two centers to accomplish this.
Send me a private message and I'll email you the photo of his installation.
Regards,
