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Lift the hatch to the correct angle and take a picture. Measure the added overall length. Decide whether you can live with the added length; else consider a Kamm-back. The closed hatch probably stiffens the back of the body.
The gap would need to fill all four sides, so you'd open the hatch, insert your filler and close the hatch on it. Any gap will infiltrate dust and exhaust gases because of the pressure differential.
A slant roof chop could help, but lowering the back changes the bottom of the car, too; increasing front end lift. Best to be level or slightly down in front.
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