I'm not familiar with the temperament of those gourami. Hopefully someone else is.
All Three Spot Gouramis are very aggressive! I wouldn't add any males if you don't want problems. I've become very good at determining male & female with all Three Spot Gourami types including Opaline, Gold, Blue, etc.
Pearl Gouramis are far less aggressive and still the males can be a hassle. If you have the opportunity to get (2) females & (1) male Gourami you'll be much better off. In my personal opinion they look much better than the Three Spots anyway and you don't have to worry about fish chasing fish as much.