If your projector is more than 40 inches away from the projector, and the ceiling is less than 12 inches from the top of the projection image, then mounting Ubi camera on the ceiling will be a clean option.
If the ceiling is too high, you can use the extendable arm to lower the camera to about 7 inches above the projection image. Below is an illustration on how the ceiling setup could look like.
Make sure the camera is positioned at the center of the display.
First, please install the camera on the ceiling mount as shown below.
Then please paste the 3M double-sided tape on the ceiling mount. Peal off the tape and paste the camera mount on the ceiling as shown on the picture below.
Ceiling Mount Setup for High Ceilings