Questions about PureMounts Spider Plus

I wonder how this mount can be INcompatible :) It has so many screws and possibilities that makes it super multipurpose. I am sure 100% it will work with BenQ TH681

Yes, this should be compatible.

Most projectors only have 3 holes for mounting. The Pure Mounts Spider also has only 3 arms for mounting. It works perfectly with my projector. You can adjust the 3 arms flexibly.

Hello, sorry, I doubt it is compatible as the Optoma HD142X uses a 3 screw mount You can find the technical data of your projector mount in your manual on page 44 http://www.optoma.fr/uploads/manuals/HD142X-M-fr.pdf