[ZeroGravitas]

Can't you run Mapumental for each home and then combine the results somehow to find the best location?

Actually, do they already support this? They say "Mapumental handles multiple start or destination points too."

I was thinking just overlaying the maps as semi-transparent PNGs would reinforce the color gradient of the nearest places.

[spicerguy]

Yes, not sure if it's exactly what I want as details are scarce but I've dropped them an email, thanks for the nudge.