F5 DNS/GTM HA Configuration

Hello everyone,

We are in the process of upgrading from the Guest GTM to a new Tenant GTM appliance. Our plan involves adding the new GTM to the cluster sync-group( no floating IP), performing a manual full synchronization, and monitoring its performance for a day. Once verified, we intend to gracefully take the old GTM offline. If all functions well with the new GTM, we will then remove the high availability configuration and proceed with cleaning up the old GTM. Any suggestions or recommendations on this approach? or is there any different approach?