Connecting external preamps to the profire 2626

I know the 8 inputs (1/4inch) bypass the preamp on the 2626. How would I go about attaching a API 512 c in a Chameleon Labs CPS-501 Powered Chassis
Item ID: CPS501 case? This case only has XLR output.


I was also considering the BGU-1 that has unbalanced 1/4 outputs