Rear bicycle rack for car with mini-spoiler I have an Audi A1, which has a small spoiler on the back; it's built into the car, not something I have put on. I have been looking for a bike mount/rack that I can place on the rear of the car. 

A member of Halfords (popular every-day automobile and bike store in the UK) staff told me that because of the spoiler at the top, there isn't a suitable rack for this type of car. At least not one that they sell.

I am aware brand recommendations are a bit off-topic here, but perhaps there is a specific type of rack I need to be searching for? Roof mounted rack is not an option for me unfortunately.
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: