How to add 5000+ Devices

Hi,

My problem is I have 5000+ devices to add:

1. Is it possible to add all the devices in a single Opmanager server ?

2. If yes, what would be the hardware requirements & licensing for that ?

3. If not, how to do it? If i install 4 different opmanager servers in 4 different locations, how to make synchronization between all the servers?

4. What would be the hardware requirements & licensing for that ?

5. How to manage all the opmanager server's from a single console?

Pls provide me the detail solution document for all the above mentioned problems.