How to plumb a Herbie with 2 overflows???

[ghostman]

I'm sure this question has been answered a million times, but I can't find it in my searches. I'm getting a 240 gallon cube with 2 overflow boxes. I would like a silent overflow system and have researched the Herbie. How can I do this and have it be balanced? If I put both Herbie drains in 1 overflow, could I use the other overflow for 2 returns? What about the water in the return overflow? Would it get stagnant with no turnover? I'm at a loss:headwally:
Please help!!! If anyone has return pump recommendations, that would be great too. I'm leaning toward a Reeflo Dart.
Thanks to the plumbing pros and gurus!!!!!

 

[wildman926]

They must be set up separately, i.e a silent/siphon with a backup per overflow box. Also, drains must be separated as well, or you will get the noise coming out the emergency overflow tube.