Economically speaking price/performance/longevity:
If it was my space, I'd buy an 8 in-ceiling package, all 8" coaxial and put one in each treatment room, 2 in waiting and 2 in the morgue/office area for paperwork and filing after hours.
Then I'd run it all on something like a leviton HAI hifi zone amp with 4 zones output. I did a structured wire in a million dollar home with a mix of 6" and 8" coaxial in-ceilings spread over 8 zones and the house rocked with all zones running simultaneouly. The master bath got 8" drivers and it was like a dance club in there. After the work was all done the builder (my friend who builds custom homes) threw a rager before it was cleaned up for listing.
