GCP F5 Big IP VE cluster

Hello GCP Cloud Guru's. Does someone here have some experience with GCP public cloud platform and F5 integration using Big IP VE APM?

How does session synchronization work across two members?

Is configuration being synced or is it better to use Big-IQ to perform configuration management?

How does routing exactly work between Firewall in de cloud and the Big IP Ve, is BGP required and/or should we always SNAT?

How is Active / Passive clustering work with API calls?

With the following template I understand both F5 Big IP APM should be in the same network?

https://github.com/F5Networks/f5-google-gdm-templates/tree/master/supported/failover/same-net/via-lb/3nic/existing-stack/byol