Sending Groups Back to their originating OU

I am setting up to export group changes back to AD.

My question is: Without defining an OU in the sync rule will group updates automatically go to the originating OU?
Since I have defined the containers to include in the ADMA I would assume this is kept somewhere in FIM or the MV.

Unfortunately, all instructions for setting up outbound group syncs point to the test FIMObjects OU and fail to answer this question.