I thought all the 2017 XE 20d Premiums came with a SiriusXM radio. Misread the Jag website. Jag website made it seem like the Premium had everything the base model did, but I was mistaken. Where can I mount the antenna? On a normal car, it sticks to the roof with a magnet. My roof is aluminum. Anyone else added siriusxm to a 2017 XE yet?