Assuming you have at least a 5.1 capable sound card, the Edifier S760D is the best powered surround set up I’ve been able to find. There really doesn’t seem to be a lot of options anymore but for gaming and movies/tv the surround is definitely worth it.

Edit: Though looking around it seems like they’re basically impossible to find atm

You probably have the unit allocation size set too high or low, Mac OS will only mount it if it’s 128k to 1024k.