Rear bicycle rack for car with mini-spoiler
The spoiler does not preclude using a rear mounted rack.

I have an Audi hatchbach with a similar spoiler. I use a Yakima King Joe (model discontinued but Yakima and Thule offer functionally equivalent products) which has a wide span between the upper and lower arms.

The upper arm sit on the rear glass near the top, or tucked up underneath the spoiler. The lower arm sits below the number plate.

YouTube video of installation of the rack on a hatchback: