HD3SS215: followed by a SN75DP130

Hi, i am attempting to make a three channel, 2 to 1 mulitplexer for displayport with USB switchover.  (Basically a Keyboard/video/mouse that can switch DP and USB between 2 computers, with the specialty that i am switching over 3 displayport links since the computers drive 3 monitors. The USB port is 3.0 and has 6 downstream ports 

My question is on the displayport block : i am using the HD3SS215 (i don't want to use the microbga package of the 214 as it makes my board too expensive) as multiplexer followed by a SN7575DP130 as equalizer/redriver. There will be 3 sets of these in the mux. ( 6 incoming DP's , 3 outgoing DP's)

Since the incoming signals are already capacitively coupled ( the signals leave the computers like that ): how does the multiplexer gets its common mode voltage ? does it get it from the pull ups in the sn75dp130 ?

Do i need to add capacitors on the differential pairs between the mux and the SN75dp130 or not ?

The following path looks logical to me :

DP input connector -> MUX -> SN75DP130 -> capacitor -> DP output connector. This gets the common mode from the 75DP130 inputs on to the mux.

or should i do this:

DP input connector -> capacitor-> MUX -> SN75DP130 -> capacitor -> DP output connector. (does not seem logical as the signal is already capacitvely coupled coming in )

or this

DP input connector -> capacitor-> MUX -> capacitor -> SN75DP130 -> capacitor -> DP output connector. ( does not seem logical as now the mux does not have a common mode voltage )

Thanks