Recommendations for new D Tivo service

An elderly couple I have known many years have C service with HD Tivo/cablecards. They have had trouble with the cards in the past and the Tivo has bit the dust. They received an HD DVR from C until they can decide what to do.

They are fed up with C and the cable cards. They do not like the "new" DVR interface/learning curve and would have the same reaction to an HR-DVR.

The new D Tivo DVR would seem to be ideal for them. They only require one DVR and an SD box in another room although they have reported a few times needing three tuners, but that is rare. The monthly cost of a second Tivo on the main TV would not be an issue.(changing inputs might)

This seems to me to be a simple straightforward install but I'm not up on the Tivo so:

Is the Tivo interface the same as the older stand alones? Peanut? etc.

Will D allow two DVR's on a single TV in a new install?

Does the Tivo require/use phone or internet? VOD?

I am aware there is no MRV with the Tivo.

Any input would be appreciated. Thanks