I have three male honey gouramis in my 29 and they get along fine. They do some playful chasing now and then but they don't seriously fight. Two of them are full grown, but were bought together as juveniles, so that may be a factor in their compatibility. The smaller one is a loner and never bothers any other fish, and is ignored by the bigger gouramis.
From what I understand dwarves are a bit more aggressive than honey gouramis, so I'm not sure how it would work with more than one male. Probably better to keep one male, or a male and a couple of females.