My first and biggest question is, do you HAVE to run MariaDB to utilize CyberPanel? Given it is a drop in replacement for MySQL I would assume you could utilise MySQL 5.7 and theoretically the panel shouldn’t even know that it isn’t running MariaDB other than perhaps repo updates.
Secondly, I notice it requires CentOS 7.x, for those wanting to run a professional environment with support is this also compatible with RHEL?