OK, back off topic.
Do we know if your Escort is a notch or fastback? Unlatch the trunk and drive to the top end and see where the air wants to put it. It sure won't be clear open and it probably won't close, so the angle where it is comfortable will give you a data point.
The air brake on the Mercedes Roadster would open as easily as a parachute but be hard to close, the dive brake on the Dauntless could have to be forced open and close itself, while the plate on the roof of the Mercedes coupe pivots at the center of pressure for the easiest motion, but has additional drag.
If it's a 4-door, just put hydraulic rams on the two back doors.
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...any ideas for the back of the car...
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Yes. Start a new thread.