My wife's 2014 Volvo has the same things, speed limit sign recognition and lane departure warning, powered by MobileEye.
There's a sensor box attached to the windshield below the rear view mirror. Same area where I mounted a dashcam in my Model S.
Judging from hers, I don't see a need to replace either the windshield or rear view mirror. There isn't a hole in the glass for the camera. It just looks through the glass.
Does your wife's 2014 Volvo also have forward collision warning?