I made a video explaining how to get a single PC link-up version of Supermodel working some time back. I talk about how you take the information for setting up a single PC network and modify it to run a multi PC network at the 17:53 mark.
https://youtu.be/CXzI4AfqrEQThe way you set a Supermodel network up has changed slightly since I first made this, because of the way the new network needs some slightly different info in your ini files, but I talk about what the differences are in a comment I pinned on the video.