In your design, it's recommended that you implement vCenter Server on a VM. This helps the system administrator set up vCenter with HA mode. This will enable the vCenter Server VM in the event of a hardware failure, and the cloud consumer will be able to enjoy the benefits of using the cloud.
Another point to take into consideration in your design is that vCenter Server sizing should consider the growth benchmark of 20 percent for every year. Also, in your design, consider isolating the VMware vCenter Update Manager from vCenter Server during the off-maintenance period.