Moca advice needed.

I've never needed moca for my 2 premieres, the wireless adapters worked fine for room to room streaming. But over the past year or so, I've since added xbox, roku, slingbox, Blu-ray into the mix, my streaming is not working very well. Some of these are cabled, with the cable running down the hallway

TW has updated my old modem/router with one that is moca capable.

So now for question.

room 1 has xbox, Blu-ray TiVo Premiere
room 2 has slingbox, roku and TiVo premiere.

would 1 moca adapter in each room, with some sort of splitter be enough to handle the 3 devices in each room? Or is there a better way to go?

thanks for any help.