Multicast in Catalyst Center is scoped per Virtual Network and controlled via multicast pools + RP definitions. So what you want (separate multicast “instances” for different services) is achieved by design segmentation, not by multiple PIM instances.
https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2025/pdf/TACENT-2028.pdf
I am not a Cisco employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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