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Notice that in the Ford Fusion picture, the rear deck element is raised up a significant amount in relation to the initial vertical placement of the trunk. If visibility is not a big deal in your car, then you could make your rear deck element about 3-5 inches above your trunk to get a much smaller transition area, which could greatly reduce that turbulent bubble behind your back window.
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No, it ain't.
Decklid extensions like that go out horizontally instead of up at an angle (Nascar) because they want low drag more than they want downforce. Going out horizontally instead of up to meet template reduces the rear wake area.