Considering adding a Bolt, already have a Roamio.

Hello all. I have what I think are simple questions but I'm unsure how this will all work out. I am adding a TV to my kitchen, and the original plan was to simply put a mini on it. But then I thought that this could be an opportunity to add a Bolt to get myself 4K ready.

Current set up:
Roamio in the living room
Mini in the bedroom

Proposed set up:
Bolt in the living room
Roamio in the bedroom
Mini in the kitchen

Here are my questions about the potential set up.

Would I need to get a...

Considering adding a Bolt, already have a Roamio.

Considering adding a Bolt, already have a Roamio.