increase unet hosts

hi. im working on a simple multiplayer game and im using unet.
in my game , i have one map and that is my online scene.
i want to use a dedicated server and i want to know how can i increase my hosts on dedicated server.
i mean when player click on connect as a client, for example in lobby there are 4 host exist Instead of one host for connecting. and player chose one of hosts and then play on that room.

so i want to know if i use dedicated server for my game, how can i have multi hosts for an online scene ?