If you are looking at guaranteeing a minimum of 3 games per team and build the most comprehensive format possible for your small size category, the FIBA 3x3 Team recommends:

To extend your KO bracket so that the top 3 teams qualify to the KO bracket where the 2nd best teams of each pool will play against the 3rd best teams from each pool. Top teams from each pool get a BYE.

Your final view should look something like this: