Is it possible to self host a jitsi meet instance were only the admin can start a room. This way anyone can join the room the admin created but others cannot create a room and use the service for their own purposes.

Is it also possible for the admin to create several accounts on a self hosted instance but nobody can register and create their own accounts, and have any of these accounts be able to create rooms whenever and only those with an account can create a room on the instance. This way the admin can create accounts for their friends and family but nobody can signup to the instance and only those with an account can create a room. Anyone can join a room which does not require an account.