Help regarding splitters/combiners

Hi,
I'm working on a conducted interference test plan. I have one interferer network and one victim network as shown in the attached schematic. Each network has two transceivers. Transceivers belonging to the same network should exchange data frames. All these transceivers are interconnected using cables through splitters/combiners (rather than over the air) to exchange data. Interferer network is introducing interference to the victim DUT.
My question is would the splitters/combiners work for this application? In other words are they full duplex devices that can transfer signal bi-directionally? Also what would happen if a splitter/combiner (C1) has signal on both its sum port (Ps) and one of its input ports (P3)? Would that create a problem for other input/output ports (P3). Thanks for the help.
P. S. I'm using mini-circuits ZN4PD1-63+ combiner/splitter.

Samer

Ports with matched impedances normally have 20~40 dB isolation,

With 4 port splitter, middle pair will have the best isolation between ports.

Inject interfering signals into one of the taps in a bidirectional link and use two splitters sum to sum for injecting interference in both directions. For better two way isolation a smaller tap is required such as a DC-30 or single -30 dB tap which of cource has lower insertion loss between in& out for attenuated signals. But better isolation between tap and input. A power pad switch may be needed to regulate CNR ratio with Tx power levels.

I did this for 1GHz Rician fading effects on BER vs CNR and RSSI using matched receiver integrate and dump discriminator.

Thanks SunnySkyguy. Does that mean that I can't rely on the combiner/splitter configuration I have (along with isolators). In other words is it necessary to use taps on interferer link to improve isolation? I'm sorry but I don't have deep experience at RF components level.

Samer