Wherever you place them, that's where the fish will be. So...make sure that you put at least SOME within casting distance of a good fishing spot.
Past couple of winters, I've driven the county roads with my chainsaw fueled up and cut down a couple dozen cedars each year (county Right of Way). They're cheap (FREE!) and cedar lasts FOREVER. County boys love it...they'd rather not have to do this, and it's always August when they get around to it.
In a lifetime, the average driver will honk 15,250 times. My wife figures I'm due to die any day now...