The Rev Roof Top tent is a perfect partner for any Subaru Outback.    The only caveat - it is not recommended to use the Subaru supplied (OEM) cross bars.   Read this thread for some cross bar suggestions if you need to make the upgrade.  

https://www.reddit.com/r/Subaru_Outback/comments/1elmzl3/rooftop_tent_on_oem_crossbars/