@rdesoju You almost answered your own question 
DMR is effectively MNR for guaranteed messaging. MNR only supports DIRECT delivery mode (“fire and forget,” “reliable,” or “pure pub/sub”), with which there is no persistence.
If you have DMR between triplets then yes, you have Guaranteed Messaging between triplets. In this way you form a cluster of triplets, which are linked together, share information on where an application is listening to guaranteed messages, and share these messages appropriately.