You are designing a hybrid cloud environment where your Google Cloud infrastructure connects to your on-premises network via HA VPN and Cloud Router in a central transit hub VPC (using default settings). Your on-premises DNS server is at 192.168.20.88. How can you enable Compute Engine instances across multiple spoke VPCs to resolve both on-premises private hostnames under the domain corp.altostrat.com and Google Cloud hostnames while adhering to Google's recommended practices?