@luisbergamimkeep in mind, that the RTSP stream has a limit of 2 connections. So the 3th person won't see the camera stream.
What you can do (which is also a more secure way).
Use a software to capture the RTSP stream and put it on the website. From there it can be streamed to many devices. The limits here are just the server specs.
There are many different software solutions for this, but I don't have much experience in them for a suggestion