The knowledge base of McAfee: KB70278 describe us to follow the solution below. What if I install "Dual Server (External)" in primary proxy server and install "Dual Server (External)" again in secondary proxy server. Will that also work without problem? Unfortunately, KB70278 only for EMM 9.x. I choose the step above as I don't want to miss anything. Do you guys experience this scenario? Thanks!
Use this solution if you plan to deploy EMM with the Proxy in a High Availability environment.
Identify the server configuration, create a cluster, and install components other than the proxy
In this scenario, there is a need to maintain a High Availability environment where the Proxy is always accessible, or there is a need to install the Proxy on two or more server nodes that are on a cluster with load balancing.
Install the proxy on each node
Repeat the steps in in the section "Install the proxy on each node" to install the proxy on each node of the cluster.