I guess that rear windshield is a real pain for tinters. There isn't enough room from inside the cabin to do it because of that glass divider obstructing the way. The only real way to do it was to push the button to close the cover just up until that rear flap flips up and let go. Even then it's a very tight fit as there is that extra layer of cloth there tied to the frame of the car which has to be pulled away from the glass by one guy and the tinter goes under the flap.
Also, in case when they're tinting your car and your top stops moving because you stopped it midway, turn your car off for a full 5-10 minutes. My top stopped responding on me a few times probably because the car freaks out that you turned it off while the top was halfway to closing or opening (because in a real world situation, why would you ever do that?).
Here are some pics of the tint job. Using Lumarr FormulaOne tint, 35% all around:
