What models do you have and how are they currently connected to your network? If they are all ethernet networked through a router, then all you have to do is fire off an email to have them enable the 'unsupported' MRV method. DECA is the official supported method, so if you have issues and want them to help you, that's the way it needs to be done. But there are plenty of people here doing it the ethernet way with no trouble.
Depends on what type of deca. A receiver deca or broadband deca? If you have anything older then a HR24 then you'll need them unless you go with jersey method. I've heard goods and bads of both so really it's however you want to do it
Went through all of that. At first, of course, he told me that it couldn't be done without DECA. After I told him that there were updated pages in the DORIS database, he changed his tune. He got it added to my account, but I couldn't share my playlists. After we hung up, I took another look. Went into Network Services in the menu and tested again, and voila! Everything was there.