You should have at least 1 instance of Chaos License Server installed in your network. After that - point the license settings on the server computers (render nodes) towards the machine with the Chaos License Server installed.
More information and setup scenarios regarding this can be found in our documentation here.
The explanation on how to set up the license server configuration through the configuration file can be found here.
For instructions how to activate Corona on multiple machines, see:
Activating Corona 8 or newer on farms and computers without host software GUI