Configuring Distributed Availability Group with multiple SQL instances

I am trying to create multiple SQL instances each with its own AG (and listener) on 2 Windows clusters in a Distributed AG as follows: - Two sites - Primary & DR - Each site has a WSFC configuration - PrimCluster & DRCluster. - PrimCluster has two nodes - PrimNodeA & PrimNodeB - DRCluster has two nodes - DRNodeA & DRNodeB - Each node has two SQL AG replicas each with an AG (with its own listener) as follows: - on PrimNodeA & B - Instance1_P_AG - on PrimNodeA & B - Instance2_P_AG - on DRNodeA & B - Instance1_DR_AG - on DRNodeA & B - Instance2_DR_AG - DAG configuration asynchronous between the two clusters. - Each local AG is synchronous availability mode and holds its own AG databases. - all the secondaries are non-readable This is my first experience with multiple SQL instances on a cluster, each configured with AG and DAG between the two clusters. My Question please: - In order to create the DAG, do I need to create a DAG per AG pair as follows: - Instance1_P_AG and Instance1_DR_AG - Instance2_P_AG and Instance2_DR_AG In other words, do I need multiple DAGs or just one between Instance1_P_AG and Instance1_DR_AG will cover all instances in each cluster? Also, I would appreciate a link to an article on multiple SQL instances in a DAG. Thank you