Architecture:
a) Set up ocm1.localdomain 192.168.56.11 as regular Linux VM [will house Oracle Client]
b) Set up ocm2.localdomain 192.168.56.12 as regular Linux VM [will house CMAN config]
c) Set up ocm3.localdomain 192.168.56.13 as host of a 19c database orclcdb/orcl
Note1: Turn off or open ports on local firewalls if present.
Note2: Ensure /etc/hosts has all machines listed if not using a DNS server. Use machine names in configs as REMOTE_LISTENER registration seems to rely on them.