Bit confused as I’m seeing plenty of posts mentioning different mounts for the XT. I intend to remove my nav IV,V,VI BMW holder as I don’t want the XT to look like an after thought. I’m looking at purchasing this week, but want to know if I can attach the XT to the horizontal bar straight from the box without buying an additional clamp ? Not bothered about security as I will remove when away from the bike - thanks !