Anyone know of one of these that will fit on the rear of a 2010 BMW 3 series

Sorry touring/estate model

We had a Halfords high mount advance (rebadged Thule) that had metal tie bars and a simple clamp lever system. It was much, much more solid and simple to fit correctly than the multi straps and buckle system of our previous rack. It came with all sorts of strap lengths and instructions for most cars around. I could swing my weight on it, and six years of multiple bikes it never moved once, and never slackened.

The spoiler is probably your biggest problem as most racks fasten at the top of the lid.
I have a saris bones rs and it’s a great rack but don’t think it would work with your spoiler.