I have the same concern from the place that I’ll likely get mine done at once I do receive the car. They do tint the rear and said that it would blend in but didn’t have any photos to show me however have assured me that they’ll make sure I’m happy with it.I just don’t want a visible line in the glass, from where the tint starts - assuming it’s noticeable.
I found this example someone posted from inside the car looking out and will use that as an example of what I don’t want.