You can try making sense of this:
http://www.eqemulator.net/wiki/wikka...ServerLauncher
I only have 1 linux server configured atm, so I haven't tried my own advice of spreading the load.
But I think it comes down to running a world somewhere, pointing your 2 "zone" servers to that server as the traffic cop. Using EQLaunch [launchername] with the appropriately configured eqemu_config.xml file on each server, with the port ranges set and port forwarding configured of course.
And yes, you can have as many launchers as you want, I believe. I am running "Zones" and "Cities", the latter being static zones.