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Hello,
What is the Maximum Number of Instances Can We Install on Windows?
According to: https://learn.microsoft.com/en-us/sql/sql-server/maximum-capacity-specifications-for-sql-server?view=sql-server-ver15:
50 instances on a stand-alone server.
25 failover cluster instances when using a shared cluster disks as storage.
50 failover cluster instances with SMB file shares as the storage option.
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Shouldn't be a problem. As far as max number? At some point you may run out of server resources.
https://learn.microsoft.com/en-us/sql/sql-server/install/work-with-multiple-versions-and-instances-of-sql-server?view=sql-server-ver15
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