Ok, thanks.
So if I read that correctly, I can install a second FXTI board in the topside box with some short jump cables from one with tether terminated in to the second board? Then I can just have 2 USB outs?
I have integrated a Canon EOS R6 mk2 - however the setup should work with pretty much any DSLR that has a USB out and manufacturer desktop software. I have given a long winded run down of the setup that describes the evolution, here Integrating Mirrorless DSLR camera system with BR2