Once again, his constraints are that he needs to use inceilings. The answer is yes, he can get very good sound from quality inceilings.
...
Very few situations (room layouts)
require in-ceiling speakers. Just because a room has been pre-wired for in ceiling doesn't mean one has to use them.
I like to quote Dr Floyd E. Toole, VP of AE for Harman International.
"I accept ceiling speakers in airline terminals, and tolerate them in
“music everywhere” uses in homes.
I do not endorse ceiling speakers in multichannel music or home
theater systems."
"The challenge is to get people into situations where they can hear
good demonstrations of multichannel entertainment, using good
equipment. The entry-level in-wall/in-ceiling systems, and systems
with inadequate tiny surround speakers can be impressive if one is
easily impressed. However, those of us in the business need to show
customers that much better sound is possible, and sometimes for only
modest cost increases. Good in-wall speakers exist, but they are not
inexpensive. Ceiling speakers are for background music systems in
stores (I exaggerate, but only slightly). Ceiling speakers should never
be used for the front channels, and used for surround channels only in
homes that I am never invited to."