Yes, you can mount LF2 to the ceiling.
The LF2 "feet" unscrew to reveal M4 mounting points (e.g. for a universal projector/ceiling mount), so any 3rd party ceiling/universal mount should work. We are working on some upcoming accessories to make things easier.
The LF2 can act as a regular projector and can be mounted upside down. However, it currently does not have the capability to flip the projection. We have deactivated the autofocus and the auto keystone capabilities as they interact with our scanning workflow. We plan to add the feature in the Lightform Creator software to invert the image for LF2 ceiling mounted. This will be available in one of our upcoming releases.
You can see the full specs here https://lightform.com/lf2#specs