hehe people / some people are always looking for a short cut, and its not like they are stupid people, they soon find out where a fake are put and there are no consequence's for their actions.
So it is important to stay ahead of these kind of people, and a little randomization do a long way here as those people are like most of us creatures of habit.
I dont get the Danish speed trap cars always deploy the exact same places day after day to a degree you can almost set your clock to them, i find that immensely stupid and they only go to a new place if there have been complaints.
Personally i would drive around in my speed trap car and look for new places where i could set up shop, and i would like to be at least a few days in between me being parked in the same spot.
Dont get me wrong i might still be on the same road, but some days i might just be a mile or 2 down the road.
Though with the speed trap apps you pretty much know where they all are, but there are still plenty of people that forget to launch their app before they drive like a idiot, and you might also catch some at a new spot before your location get tagged in the app.