Question about LG PH510PG

The projector has a normal 1/4 inch thread (max. 4.5 mm), which is more common for cameras (or studio equipment, lamps, etc.). You can find various solutions for this from different suppliers if you look up "ceiling mount for camera" in Google, for example.
At Digitec, for example, there is this: Elgato Wall Mount.
If you search for "ceiling mount for projector", I don't think you'll find much. They are usually designed for projectors with 4 screws in a different weight class.

The problem is not so much the mounting option, but the lack of a setting in the configuration of the projector to display the image upside down (it is visible, but inactive). Unfortunately, this is not possible with this projector. For this reason, I built a wooden ceiling mount myself. It works without problems, but requires a little extra effort.