Ceiling Mount: Know the fixed distance between the projector and your screen. Different projectors have different 'throw ratios". Throw ratio is the relationship between your projectors distance from your screen to the width of the image. For example, if your projector will be ceiling mounted ten feet away from your screen, your image will be larger than if your projector is only five feet away.
*Be sure to leave enough space between projector and wall to ensure proper ventilation.
HELPFUL HINT: If you want to mount your projector on the ceiling, it will need the capability to project the image upside down. The large majority of projectors do this today, but you must verify that a ceiling mount exists as an option for this product.
Table Top: If you will be setting your projector on a table, consider a projector with less fan noise. Aim for around 35dB or less for 'whisper quiet' fans. You may also want to consider the overall product case design since the projector will be visible.