That's pulled back quite a lot. 24"?
To my eye, it's high-tailed. The air under the car is different than the free flow over the top. Best practice seems to be a diffuser with fencing and cross-fencing.
But since you favor that profile, why not just have it hinge and drop by the departure angle on level ground. My guess would be maybe 18" to clear the hatch's arc.
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