Hi r.riechers
Yes this is a possible configuration with 2 x iDR16. Though this would mean that you would have 3 seperate systems as you would have 3 independant mixracks just sharing audio.
If you would prefer to have just 1 system that controls everything from 1 surface I think the setup for you would be to have 1 x iDR16 and 1 x xDR16.
You then connect the iDR10 to the iDR16 to link 1 of the ACE module in a DualRack system with the MMO fitted for Aviom.
The xDR connects to Link2 of the ACE module with Dante fitted for record.
Hope this helps
Sam