Skaaq sent me an e-mail with the following super easy way to make a server for Suicide Survival:

I don’t know if someone find this solution. Simply launch the zombie panic source dedicated server tool, (you can download zombie panic source for free its just a mod host by steam( and a very good mod)) and choose suicide survival. It work for me. And way more easy. I already make a 8 players game true internet. So if that can help.

So yes, this works perfectly as well. 🙂 Thank you Skaaq!