Installed a 2150st recently and had to move it back a few inches today. Got it pretty close. Zoomed it out past the screen by a hair. No keystone. Angled ceiling but the mount I'm using is pretty nice. Kanto P301. Will deal with cord management after I get a flat HDMI cord and replace the white screen material with a grey one. Love the projector despite getting it used on eBay with 1100 hours.
Pioneer Elite SC-05/SC-25
JBL Studio speakers - both rooms
PSA V1800, 3 MFW-15's, ported UM18-22
BenQ W7500, Oppo 103s, ST 16:9 110" white
Benq HT2050 2nd system-96" Carls Flexigray