We have had water dumping into the 2nd row of our Tesla Model X when it rains and we open the Falcon Doors. Rather then drive 75 miles to the service center and let them re-due the door gaskets I ordered this: https://www.ebay.com/itm/221757902907 It is a very small (1/4") vinyl molding. I cut the beginning and end of the molding at an angle with a knife and installed it right along the edge of the roof next to the falcon doors. The water just runs along it and down either the windshield or the back window when the doors are opened in a heavy rain. You can barely see the molding on the car. I think Tesla could easily redesign the top to incorporate a small gutter like this and not rely on the gap between the door gaskets to keep the water out of the car. I cut the molding to approximately 43" in length. It needs to be placed close to the opening of the Falcon Doors on the center roof section so the gasket on the door goes over the molding. The tight spots are at the beginning and end of the door. The door gasket drags on the drivers side rear of my car, but works fine. it might be possible to shorten the molding so this doesn't happen and still get the desired results.