Typical direct drive compressors make a hideous and loud noise. I ruled out that type based on just the sound before I started. I think the first thing to consider is a quiet compressor because it is going to run about 30 to 60 percent of the time.
Also consider how moist the air is. Mirrors do not like moist air on them as that can cause the mirror to fail. I run an air dryer on my compressor for this reason.
Cheers
Keith
Universal Laser VLS6.60, Tantillus 3D printer, Electronic design
edns Group, Mairangi Bay, Auckland, New Zealand