Topic: Using both FF800 and FF802 in Pro Tools 12

Hello there!

I'm trying to use both FF800 and FF802 in Pro Tools 12.
At this stage I've got both firefaces connected to each other with firewire and ADAT cables. ADAT 1 out from FF802, in to FF800 and ADAT 1 out from FF800 in to FF802. The FF802 is also connected to my iMac with firewire.
I suppose the next step is to route in TotalMix, and this is where I don't know what I'm doing. Any help is much appreciated!

Thank you!