Hi baber
You are correct for the VM machines and IP addressing.
Please find below comments to your thoughts:
1. You can use either site A vCenter IP address or site B vCenter IP address to manage both environments. No matter which vCenter you login to, you will see both vCenter inventories in the web client and you are able to manage all your resources in both sites.
2. The two PSCs are sharing the same SSO domain and are replicating to each other. If you want to design for resiliency about PSC failure at each site, you can add 2 PSC controllers in HA mode with a load balancer in each site, then point the vCenter to the load balanced PSC VIP address. This way you will survive the failure of one PSC controller per site. The topology will be as below:
Hope this is clear now,
Regards
