Another stupid? Moca question

I just purchased a Roamio Pro and streaming to my iPad and phone using an Ethernet/Moca network works most of the time. I would also like to add my Premier (2 tuner) to the Moca network so I can do the same and also do transfers between the 2 boxes but I don't know if adding a Moca Adapter to the Premiere will do the trick. Tivo says it will. They say to add an adaptor and add the Premier to the Moca network: "If you are changing your TiVo box's connection method to MocA, go to 'Settings' > 'Network' > 'Change Network Settings.' Then choose 'Connect using MocA.'' Presently there is no option on the Premier under Change Network Settings for Moca. Will this option be there after I add the adaptor?? And will this then make streaming and transfers happen? Presently the wireless network the Premier is on is too slow to do this.

Also, if I change my gateway/router to Moca capable (I think Xfinity has one) will I still need the Moca adaptor on the Premiere?

Any input is appreciated.