I'd just get the hitch one myself. The hatch probably won't stay up with just a rack attached let alone a bike on it. You'll have the added expensive of getting a hitch. But then you'll have a hitch to use for hitching things and stuff.... And with a hitch bike rack you can cover your plate(by accident of course) to avoid photo radar tickets.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)