So.. going to keep those two males in very small containers inside of a tank filled with females? Possibly a bit stressful.. seeing another is one thing if they have their own space, etc. But this could be a problem as the females may become aggressive with one another because the males are so close.. etc. Those really aren't bigger than the cups they come in.. 1/4 of the container they can't access due to it being a trap for live fry.
Best solution is either-
Make/buy a divider and divide the tank.. can divide it into 3-4 sections if you wish and have 3-4 bettas.
Keep one male in there with a few peaceful fish and have a separate tank (1g+) (with heater) for the other male.
Keep one male and return the other.
Get 2 more tanks (1g+) with heaters and keep the males in their own and set up a community tank.
I recommend getting something a bit more appropriate for the 2 fish you have before bringing more in. That is a temporary solution, but really shouldn't be in there long term under those conditions.
I would do a bit more research on these fish
to help you out, so you can understand what you can and can't do with these fish. They are pretty, and many people believe they live in puddles and require nothing.. but they actually require specific care and treatment.
I just don't feel comfortable recommending other fish at this time until you find a way to house these two males appropriately... wish you the best.