A company runs a fleet of virtual machines in a subnet named 'app-subnet' within a VNet. The VMs make a very high volume of outbound connections to a third-party SaaS API over the internet. Operations reports intermittent connection failures with SNAT port exhaustion errors originating from the default outbound access and the Standard Load Balancer outbound rules. You must provide scalable, reliable outbound connectivity with predictable public source IPs while minimizing SNAT port exhaustion. What should you implement?