You can mount a small XM antenna (about 2"x2"x1") on your dash at the base of the windshield. It has a magnetic base that locks it to a speaker grill I have at that location, but it can be mounted with supplied double-backed tape. The only stock option I saw for the XLR was the ugly OEM "wart" antenna that mounted on the rear decklid and required drilling through it for proper mounting.
I bought an antenna through Crutchfield--
http://www.crutchfield.com/p_209XMIC...llation&tp=149 wired it in to ensure it would work at that location; tested it thoroughly in different orientations with the top up and down, then permanently installed the cable. It works like a champ and is virtually invisible.
I hope this helps you.
CC