Your garage
opening should handle the LC just fine. You have about the same amount of clearance at the opening as I do. The fin is not the issue as it is lower than the roof rack when you enter the garage.
I share your concern about your garage door's lowest point once the LC is past the entry since the top of the roof rack measures about 77.75 inches from the ground. If your garage guy could run the track higher, you would be in the clear.
Here is another picture from inside my garage...
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View attachment 2428
The second picture is with the rear hatch fully open (position 5), so the fin moves 90 degrees to point straight up. In this position it is the highest point of the car at 5 inches taller than the roof rack or 83 inches from the ground. This would be the target height your garage door installer would need to have the open garage door higher than in order for you to open the back latch in the fully open position.