Can one ICM server be used for multiple clusters?

Can someone tell me if an Internet Cluster Manager server can be used for more than one cluster?

I have 2 clusters setup, Staff_Email and Student_Email. I’m looking at setting up a separate dedicated ICM server. Just wondering if I have to set up 1 ICM server per Cluster or if the same one can be used for both Clusters.

Thank you for your input.