I'm not sure but why would you want to train rebounding for the team. Rebounding C/PF is way better because it's quicker and if six of say 12 players on a team gets full training it will be faster.
C/PF train 1.75 per week, unless they are over 24 then they train 2.5 (speed training thread says this).
Training team rebounding would probably be about 8 weeks and if half of your players can get a pop every 2nd time you train rebounding it will improve twice as fast. Lets say a team of 12 players pop in rebounding every 8 weeks, thats 12 pops in rebounding in eight weeks, now you train C/PF rebounding and it takes 2 weeks to get a pop from every player that plays that position (lets say 5 but you can train 6), thats 20 pops every all together. It's quicker to improve rebounding by training C/PF and if you want to focus rebounding on 2 guards, just play them out of position in a scrimmage or cup game, if not league game.