Overflow compartments and draining question

[chrissreef]

Hi, if I have 2 external overflows in a large system and want to set up a Herbie drain system...

Can I have 2 drains in one with 1 backup and in the other overflow have 1 drain and 2 backups?

i.e. do the backups have to be in the same compartment as the drain they're backing up?

Thx!