With that projector you need it 1.5" away for 80". That's the lens part, so the projector itself will sit very close to the wall.
If you go with the BenQ HT2150ST you need about 4.5 feet. Most lenses sit a ways below your ceiling height when mounted. The top of my lens is 6" below the ceiling and hits my screen at 17" below. That's with a fairly low profile ceiling mount. So you have to check vertical offset too. You may be better with a non-low profile mount. You are much better to not have to angle your projector down and use keystone to correct, unless it is an LCD. But it may fit fine behind your track lighting.
This calculator, if you haven't found it yet, is essential to planning.
https://www.projectorcentral.com/Ben...r-pro.htm#calc