Have a Springfield Victor 9mm carbine. Blow back operated bolt.
Dirty but have had zero issues with it.

Anything to be aware of if I put a suppressor on it, relating to reliability?

No, just gets dirtier and you’ll feel a little more recoil. I’ve got a CZ Scorpion and 9mm Tavor SAR, both blowback operated, and reliability suppressed has been fine with both.

It's going to get dirtier for sure - and you will sure see every direction possible for smoke to come out of it when you fire it.... LOL

It’ll likely increase the recoil too. The increased backpressure on MY Scorpion felt more jarring when I had an obsidian 45 mounted.

Shouldn’t be any less reliable. Blowback actions are generally among the more reliable. I did notice more felt recoil with my Scorpion after suppressing it. I installed a stronger recoil spring but have yet to shoot it since making that change. As mentioned, it will get dirtier, and very quickly. I like to smear a very thin layer of grease all over the internals, makes for an easier cleanup.

A suppressor reduces recoil with my Wilson Combat PCC -- a 9mm blowback. The can does increase carbon fouling, but it has no effect on cycling reliability.