I have a Scion TC and mount the bike rack straddling the spoiler and I have the larger spoiler as well. I think the best bet is to buy it and it is a bit trial and error what will fit based on which spoiler you have, etc.

As for the previous pick, I though most bike racks wanted one of the arms resting on top of the trunk? You have both on the side which could cause it to slide down or shift when weight is applied or you hit a bumpy road.