Helped for me! Another thing I found when I was driving and the sun was low behind me it made the maps and more screen impossible to see and now I got the tints it's fine! But defo the glare isn't there anymoe! Lol you must tel the insurance though! I told mine it was for security reasons and they just said it's fine!
The tinted rear window in the Up White really reduces the glare from car headlights so a tinting film should work well. One thing you may have to ask about is how well/safe the film is with the rear screen heater.