System Requirements for Symantec Endpoint Protection 12.1 RU2

Hi

I have a organization in which we have approximately 16000 clients communincating and which have separate SEPM server on different locations.

Now, we want to manage all clients in centralised environment, i.e we would configure a one SEPM to which all 16000 clients would be communicating.

Here my questions are as follows:

1. System Requirements for Centralised architecture for managing 16000 clients ?

2. How to communicate the the clients from diiferent locations to the centralised SEPM server ?

3. How to configure Failover server in case the centralise server goes down for any reason ?

Thanks for understanding.

Regards

Sameer