I apologize for not providing the answer you were probably looking for, but if you want to serve your customer well, I would advise them that the correct answer regarding is the max number of SSIDs is...as few as possible. Here is some reading to support the statement: http://www.revolutionwifi.net/revolutionwifi/2013/10/ssid-overhead-how-many-wi-fi-ssids-are.html
https://www.cwnp.com/forums/posts?How-many-SSIDs-on-your-WLAN-120016
Now, regarding the number of policies, we have dozens...one per location. I've heard of others using one network policy per floor in a tower scenario. Some would advise a preferred method is a single, global policy, then utilizing techniques like classifier tags to define vlans, security policies, qos, etc.
Perhaps someone from Aerohive could address your question with a more specific answer.
