Yep, full fenders covering spray onto the drive train and lower legs is pretty high on my foul-weather 'wants' on a bike.
Caveat: I have no first-hand experience putting fenders on a suspension bike. But...
You can get past the missing eyelet problem using P-clamps, hose clamps and/or zip ties. I have used all of those to mount fenders. Don't crank down harder than necessary on the hose clamps; they might get too tight and deform the tubes. Also, I bet your local bike shop has some ideas on it, too.
be done* but you need to think about clearances, especially how your brakes will reach around the fenders if you have rim brakes.
(note that they use zip ties to connect to the eyelet instead of machine screws)