Will my UI elements work with just a Network Manager?

Before I upload another build to my test site, I was just wondering will my UI elements appear on everyone who is playing the game at that time's screens? Seems to simple to be true that I could just add a network manager script and that's what'd happen so just wanted to see what else I'll probably have to do. I ask because I could only find documentation for gameobjects.

Also, the network address is localhost and the port just the default number I presume. Would this work? Thinking I would...

Will my UI elements work with just a Network Manager?