Rear mounted Bike Rack for a 181 Kia Sportage - Anyone got a recommendation?

I've just completed 3 weeks and 3000km using the Saris Bones. Carried them safely

https://www.saris.com/catalog/racks/kia-sportage

TBF, while the straps used for the Thule do appear to make sure most of the weight is taken off the spoiler I'd be lying if i said I thought there was no weight on it, but I'm not seeing evidence of it being high even with the weight of bikes added. That said, its only the trailing part of the spoiler on the Qashqai thats plastic, the edge that the rack straps to and that takes the weight proper is the metal of the boot. No way I'd even think about hanging it off a plastic part - it's something like 8kg by itself, add a couple of bikes to that and there's no positive outcomes.