This worked great in my WRX, but I didn't have good luck with it in my LGT. You may like it, especially since I'm sure the '15s have a different vent design from my '05.
I bought my Airframe at a Microsoft Store. They have a good return policy so if you have one nearby you can get one to try and return it if you don't like it.
I ended up designing and 3D printing one because I couldn't find one that I liked. If you have any CAD skills and access to a 3D printer I can send you the .stl files and you can modify it to fit your phone. Just PM me.