You really only want one Gouramis in your tank. The are quite peaceful towards other fish. But they are close relatives of the Betta, and share the Betta's aggression towards tank mates of their own kind (including other Bettas).
Shrimp will be a bit iffy...
Before I knew anything about Gouramis, I put three dwarfs in the same tank. The most aggressive died within a week (I think it died of stress trying to defend its territory). The other two managed to live together without physical harm, but were forever chasing each other.
We placed a dozen Red Cherry Shrimp in the tank. I know we once saw the larger of the two Gouramis eating a shrimp (but I'm not sure if he found it dead or managed to catch it). However, just after this Gouramis died (managed to get itself stuck in a decorative rock), we started seeing the shrimp "out in the open" a lot more often.
