Yes, the BenQ TK860 projector can be ceiling mounted. It is recommended that you use a specific BenQ projector mounting kit for this installation. Detailed instructions on how to do this, including possible configurations such as front or rear ceiling mounting of the screen, can be found in the projector's user manual.

Yes of course, you can connect all kinds of devices to the ports. I have connected my Applebox and Playstation via HDMI cable. I bought the version without the dongle.

Yes, the holes are in the same place in the housing.

Thank you for drawing our attention to the error in the specifications. We have changed this to "Home cinema projector". In principle, it can always happen that newer models are offered at lower prices. This can be due to the current price situation, conditions and purchase quantities, for example.

Yes, you can plug the stick in directly and select it in mode. You also have the screen mirror option. You can transfer directly from the mobile.

The "I" version comes with an Android TV USB stick. I had to google it too :)