The defaults, as far as I can tell, do work like a mirror. There's a "flip" option on the "..." menu, if you want to invert that. And there's a "hide self view"

The defaults, as far as I can tell, do work like a mirror. There's a "flip" option on the "..." menu, if you want to invert that. And there's a "hide self view" option, as well as an arrow to hide the small version in the corner.