why not here (forgive bad editing...)?
View attachment 10832
the setup could be made to look like a light pole of sorts if a birdhouse on the dside of the road looks too odd...
you'd have a lot better angle and closer view on cars going in either/both directions. being closer to your targets
would make the rest a lot easier...
Where I show it, it would slightly be concealed by a tree behind it. Closer to the street where you show it, it is more likely to get vandalized or the neighbor runs it over with their car.
I get about the same angle to the street from an upstairs window, so I may even go that route. Burying the cable would be a pain since there are buried utilities I'd have to deal with.