I believe Thule now have fixtures / bars available for IX.
Interesting. I was offered one here in Australia for my 50 and the factory hitch is so neat. There is a release button next to the rear seat buttons in the cargo compartment and it drops down when you want it. From memory too it was cheap - maybe $600 or so?
Stealth Hitches would like to borrow an iX from someone in the Atlanta area so they can size a hitch for it. The volunteer gets a free hitch. Great product. I have it one my X5.
I plan on getting this. However, for awareness for others, they were unsuccessful in electronic integration and/or working out the communication protocol BMW is using. As such, there's no way to let the car know that the hitch you have back there is NOT an object you're about to run into. So expect alarms when you try and go in reverse.