Hey,

As midserver is a backbone for discovery, creating mid server clusters and distributing the mid servers would be the best option.

Example -
Cluster A - MidServer1, Mid Server2, MidServer3
Cluster B - MidServer4, MidServer 5, MidServer6 
Cluster C - MidServer1, MidServer2, MidServer4

Cluster D - MidServer4, MidServer 5, MidServer1
..........so on

You can choose the combination as per your business requirement.

Highlights having the midserver cluster.
1. MidServer cluster will also take care of the load balancing where the jobs gets distributed which will not impact the performance.
2. Maintenance of any mid server will not impact any of the discovery schedule as there would be other midservers which can take care of the load.

3. Having multiple midserver cluster combination is recommended so that the same server set combination are not highly utilised and can be assigned to different schedules.

Thank You