I think you can add 25 remote servers to the central server.
Also, It depends on the license file as well.
Thanks & Regards,
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For <= Release 16.5, the limit is approximately 20 remoter servers per consolidation server. This is not a hard limit but based on actual production deployments. With 17.0, Entuity has made some enhancements to the way that the inter-server communications works. The limit is now higher than 20. However, Entuity recommends contacting support for installations that require more than 20 remote servers.