I would hit up eBay and pick up a Chief RPMAU and then go to Home Depot/Lowes and pick up a 1.5" metal plumbing flange and a piece of pipe that is the length you need to drop it from the ceiling. You can get it from a couple of inches to 10 feet or longer if you needed it (you don't). A quality mount allows for placement at any height you desire, it allows for flexibility in placement, and it allows for very fine tuning of the projector for exact alignment with the screen.
The RPMAU often costs $200 new, but they come up on eBay for $100 fairly often.
ie:
https://www.ebay.com/itm/164939267293?epid=1400009771&hash=item2667257cdd:g:IzMAAOSwHONg3g2IPlease note that if you ever want to sell it or anything, you can often get your $100 back as this has been the going price of these mounts for at least 10 years on the 'used' market. Plus, they will work with about every projector out there.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.