Postgres replication through 2 DCs

We are planning to install apigee in 2 sites, Main and DR.

We plan to install 2 Postgres nodes in each site (Master and slave in each site) and all the 4 nodes should be replicated.

According to apigee documentation, only 2 Postgres nodes can be replicated either both at the same site (Master and Slave) or one and each site (Master ate Main and Slave at DR).

Is it applicable to 2 Postgres nodes in each site (Master and slave in each site) and all the 4 nodes will be replicated?

If yes, How this could be configured in the response file?

Thanks

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