I’m not so worried about Sense viability, given their telegraphed expansions via Landis & Gyr and Schneider/Square D, but those growth paths are probably better aligned with a single Sense unit per house model. Homes typically only have a single meter (Landis + Gyr) and main panel (Square D), so any Sense technology injected into either of those would fit the current model.
A few of us have pulled so together some info on the Landis + Gyr partnership here:
ps: In your case, I would suggest using Home Assistant to roll-up the Sense data from all 4 subpanels. I believe the new Home Assistant Energy dashboard can pretty much automatically aggregate data from all four sources.