Hey there. I know you are interested in a trunk mounted rack, but I'd humbly suggest that you reconsider a hitch mount rack.
Curt has done a fantastic job with engineering a hitch. It is unobtrusive and tucked neatly under the bumper. You cannot see any of the supports, only the receiver. It also wasn't that expensive.
I'd call myself an avid cyclist and user of racks over the years. I've bought a number of trunk mount racks and, in the end, I've always ended up disappointed. They're okay for occasional use, but there's the risk of paint damage to the car, bike frame damage (with carbon bikes), theft and they're easy to overload (putting too much tension on the supporting straps and warping your car's sheet metal) - all of these things I experienced. Plus, you can't open your trunk with the rack on! Our car has the added complexity of the deck spoiler, which may interfere with the support straps on a trunk mount rack.
I went with the hitch and a 1upusa single bike rack and couldn't be happier. I can get in the trunk with the rack on - even if the rack is folded up, plus it looks a lot cleaner.
Of course, you know your use case better than anyone and I only offer my caution to you from my own past experiences.
I've attached a couple shots of the rack installed so you can see how unobtrusive it is (for a rack - LOL). Of course, my family is grown so, younger family, bigger rack!
Good luck in your search!!