Recommendation for number of RMP nodes

[joshdij]

In the Apigee Private Cloud, what does Apigee recommend the number of RMP nodes to be provided (through a load balancer)?

For example, "for every 5000 TPS, add another RMP node" or "for every 10,000,000 requests in 5 minutes, add another RMP node", etc.

Any insight or documentation would be greatly appreciated!