Question about ground loops using multiple Digiface and multifaceII units

I'm using a digiface and a MultifaceII on computer 1 (DAW) and 2 multifaceII units on computer 2 (speaker distribution) in a project studio. The adat- ins of the multiface are connected to 2 RME 12mics. The two 12mics are set up like this: Unit A (channel 1-12) is the master clock 48k. It sends it channels 1-12 over madi to unit 2. Unit 2 distributes all available channels (1-24) to Adat out 1, 2, 3 of this unit. The adat outs (1, 2, 3) are connected to the digiface adat ins (1,2,3). the first 12mic distributes the clock signal to all units using multiple BNC t-splitters.

So the clock signal goes from 12mic unit A to: 12mic unit B, the digiface, and the mutifaceII (computer 1) AND to the two multifaceII units (on computer 2). There is a t-split with a 75ohm terminator on the longest lead (multifaceII nr 3 on computer 2)

The adat-out of the digiface (on computer 1) are distributed like this:
adat 1 out>multifaceII adat in (on computer 1) used for stereo Phones Axes (A,B,C)on a Behringer HA4700 powerplay Pro-XL (asymmetrical stereojack in on the first Behringer HA4700's aux inputs, ground disconnected on one side) , and a full stereo mix to the main input (XLR in on a Behringer HA4700 powerplay Pro-XL)
adat 2 out>MultifaceII unit 1 (on computer 2) used for Phones Axes (D,E,F,G) on a second Behringer HA4700 powerplay Pro-XL, this one receives the full stereomix from the XLR out's of the first unit.
adat 3 out>MultifaceII unit 2 (on computer 2) is used for speaker distribution and correction using reaper.

Now here is my question (finaly ):

Also, both computers are connected to a dual screen setup using a belkin KVM switch on VGA. Does this possibly induce groundloops and what might be the steps to take to measure/prevent this?

I'm aware that it's a lot of info and a bit of a complicated setup, but I would be grateful to get some answers on the subject.

Thanks in advance!