Best practices to restrict room creation to selected group of users

I need to restrict the room creation, so that only “admin” users can create rooms, and then other people can join them.

I found this module that seems useful:

But I can’t figure out how to install it to my own Jitsi server… I have Prosody 0.11.13 so it won’t support plugin installer that is used in the install instructions.

Or are there some other, better ways to restrict room creation?

I need to have one room, that is kinda like a “landing” room where everyone can join. And then admin users invite people to other rooms.

Which authentication method are you using? How does someone become admin?