Hi
If you have multiple locations, I would suggest to install at least 1 vCenter per location/datacenter and decide to join the in a Linked Mode group or not.
But it depends on your requirements and constraints (e.g. vCenter licenses).
You might want to read the vSphere Documentation: vSphere 5.5 Documentation Center - vCenter Server Installation and Sign-In Process
Before installing vCenter Server, consider your environment and requirements to make the following decisions:
- Decide how to set up vCenter Server services: on a single Windows platform or vCenter Server Appliance, or distributed across multiple Windows hosts or vCenter Server Appliances?
- Decide whether you want your vSphere deployment to authenticate and give permissions to Active Directory users and groups.
- Decide whether you want your vSphere deployment to authenticate and give permissions to Open LDAP users and groups.
- Decide whether to use an embedded or an external vCenter Server database
- If you have multiple vCenter Servers, decide whether they should be standalone instances or joined in a Linked Mode group.
- Decide whether your vCenter Server deployment requires high availability protection.
- Decide whether you will be deploying vSphere across multiple sites.
For guidance in making these decisions, review the sections in Before You Install vCenter Server vSphere 5.5 Documentation Center - Before You Install vCenter Server