Schematic for LISN in offline SMPS circuit?

Hello,
We are wishing to simulate an offline SMPS with a LISN upstream of it. What would be the best way to add the schematic of the LISN?…should we have the two 1k resistors in there, or should we put 50 ohm resistors across the 1k resistors?....because they are there when the spectrum analyser input is connected.
Schematic situation is attached.

I would add them. Also I would try to add any parasitic capacitances that you can think of.