If these panels are already purchased or in place, talk to technical support for the manufacturer (Zeta) of the panels to find out what they recommend for networking the panels. They might have a networking solution that will work, but be prepared to be told that it can't be done with the panels that are there.
If these panels are going to be new, talk to the sales department of the manufacturer (Zeta or another manufacturer) to get ideas as to what to do.
Before calling, make sure you have exact manufacturer name and model for each panel, and also for the smoke detectors. Everything has to be compatible, or the system might not be reliable in case of a fire.