To establish a reliable Virtual Private Network (VPN) connection between a newly created Virtual Private Cloud (VPC) on Google Cloud and an external site, you need to meet several specific requirements. These include utilizing dynamic routing, implementing a shared address space of 10.19.0.1/22, and ensuring that tunnels are not overprovisioned during any failover events. In line with Google-recommended practices for setting up a high availability Cloud VPN, how should you proceed to achieve this?