The Infrastructure team at GlobalCorp is implementing a hub-and-spoke network design across hundreds of AWS accounts for their workloads, requiring all spoke VPCs to route internet traffic through a central egress VPC with a NAT gateway. What additional steps should a solutions architect take to meet these requirements, given that the company uses VPCs with public and private subnets in multiple Availability Zones, and a NAT gateway is already deployed in the central AWS account's egress VPC?