[syslog-ng] How to ensure that only my hosts log to my syslog server?

We are starting to explore laptop logging which means that I have to open up firewalls to public networks as the laptops are moved around. Is there a way to ensure that only computers configured by my organization are able to connect to or send logs to my log server? I looked at "Mutual authentication using TLS" but if I understand that correctly the client is required to have a IP/hostname that matches the CN of the certificate. I couldn't find other information but perhaps I am searching for the wrong terms. -- Evan