I'm not a fan of the current R55 spoiler offerings and have decided to try out a universal spoiler. I'm thinking about using the two screws that are near the rear 3rd brake light to mount 2 metal plates that then offer a place to mount the spoiler. I've actually tried installing 2 metal plates from those 2 screws near where the wiper fluid comes out and the doors clear it fine.

I ordered an adjustable sliding spoiler so the mounts can be adjusted to line up with the 2 metal plates. I think it will work, but I'll post pics when done. Hoping it at least looks decent, if not, I'll remove.

55 dollar Amazon Spoiler w/ sliding brackets

Then use something similar to this and see how it holds. If it sways under the weight, may need to move them to an X instead of sitting parallel. Think this might work or am I crazy for trying this?