This stunning house reminded me that although the Savopolous house might not have as many windows from every room, and banks of them, that we do see front exposure and probably such a house has views around it--this might suggest he perpetrator gained knowledge of the lay-out and had "choreographed" where to take victims so he/they would not be seen. He would have to move quickly and might decide to draw curtains or know to open them in the morning or get someone to do so. I mean people were coming by, at least the lawn crew, and it appears passerby might have been able to see into the house. If the curtains were still drawn in the a.m., was this usual?
I don't think they went there and started figuring out where to put the family, out of ear shot and eye sight, and whether to put dogs out or let in to make things look normal.
Either they cased or were given some knowledge about both the neighborhood typical weekday activity vs. weekend and the house lay-out. JMO