The recommended setup for clustered ActiveMQ nodes is a Network of Brokers. For this, an additional networkConnector needs to be added to the activemq.xml configuration file lying in the conf directory of ActiveMQ:

<broker brokerName="receiver" persistent="false" useJmx="false">
      <networkConnector uri="static:(tcp://node2:61616,tcp://node3:61616)"/> <!-- addresses of all other nodes -->

In addition, modify the Flowable Server properties to add the ActiveMQ nodes for failover purposes: