It's been mentioned multiple times that the mod currently does not, and more than likely will not, support multiplayer.
There's alot that goes into making it multiplayer ready when you do things like this. One would need to sync the AI survivors alongside the players without:
A - Crashing the game
B - Causing insane lag or jamming operations the server is doing by default causing a scheduling nightmare
C - Completely wrecking the JVM container client-side and leaving a hanging instance with the server (It's possible just really improbable, devs made awesome netcode in comparison to other games I've seen)
Not to mention the constant tweaks that'd be needed as updates roll out, such as the fabled animations update that if it hits, will probably break every mod out there until they're updated.
All-in-all this mod, while a GREAT showcase (Amazing work OP, thanks for making this and sharing it for us players) of what the fame is capable of, it's still a rather RAW implementation of it. (another member also said this earlier on in the thread, cudos to you)
Not without OP instituting it, or coding it into the mod yourself and recompiling it. I'd advise to wait to see if it's in the pipeline, or look into how to add it yourself. The OP does have a git repo you can look around in to see how you'd maybe try to tackle it: https://github.com/nolanritchie/Super-Survivors
