If you want to use Jitsi Meet at scale, Openfire Meetings should not be your first choice. I would recomend you use the standalone version from Jitsi which uses Prosody and Videobridge2 that are designed for large scale hosted solutions.
Openfire Meetings is using Videobridge1 and is much suited to small and medium usage. It is more secure and has integration with Openfire users and messaging with the familiar easy to use web interface.