Yes many to 1 (fan-in) is possible.  Same ratio as you mention above.
Hi All, I'm looking at Dell EMC Unity: Replication Technologies documentation where I found the number 16 for Max Target Systems when used Asynchronous Replication. 1 to many - so 1 Unity could be replicated to maximum of 16 another Unitys But I'm not found any documentation show me how much a single Unity array could receive coming from many arrays. Many to 1 is accepted ? Many Unitys replication to only one single Unity is possible ? Att, M Bazan
Unity XF - Max Arrays (Asynchronous Replication)