I'd say not. As a general rule to what I know of, the bayonet lug would get covered by a suppressor. Even if a suppressor was built into the weapon, I would still say no.
As for the side mounts, it would very much depend on the weapon. As a rule, I'd say that at a minimum, all submachine guns, assault rifles, battle rifles, do have side mounts. Machine pistols, pistols, hold outs, not in my game. Bolt action rifles, maybe, run it by me.