Panasonic PT-RZ870LBEJ Operating Instructions Manual page 209

Chapter 7 Appendix — Precautions for attaching the Ceiling Mount Bracket
r Dimensions for the screw holes to fix the projector (projector bottom view)
Unit: mm
134 (5-9/32") 6 (1/4")
216 (8-1/2")
280 (11-1/32")
ENGLISH - 209