I had a similar setup (I’ve now changed it).
It was BCR2k, OT, MD, and Virus.
It went like this:
OT: midi 1-8
MD: 9-12 I think?
Virus: 13-16

I used Mode S1 I believe, but this was over a year ago and I could be wrong (maybe it was S4?) As long as the midi chans are all correctly set, the BCR will control everything you want as long as you’ve programmed those encoders.

Chainwise, it went: BCR2000 IN to OT. OT OUT/THRU to MD. MD OUT/THRU to Virus