I think he said it picks up the streets and parking lots nearby. At least that is what the first interview said.
Moore is not behind the Celis house. It is north of the front of the Celis house. So even if there was not a two story house between those cameras in the back alley behind Moore Security, and the Celis home, they would only pick up the front of home, not back of home. In the first local interview he said they picked up car and pedestrian activity in the area surrounding the Celis home (side street that does lead to the next block where the Celis home is, his alley, and parking lot).
I do think his cameras could have captured something, if there was kidnapping activity that moved from front of house to side street and into his camera's view.