Unless you have a very well defined funnel or pinch point you want to monitor to see what is going past and probably more importantly, when they were going past, you might be better of with a camera or two over a permanent mineral lick. Try putting out a camera over a trace mineral block. Pour a jug of one of the molasses based attractants over it when you first put it out so they find it as soon as possible.
Checking cameras requires some disturbance, hard to get in and get out without some. If the disturbance is always in the same spot it seems less damaging. I'm sure some use it purely for scouting but to me the camera is just out there to see some of what's around. You never get pictures of them all but it's fun to see a nice buck and at least know he passed through, it really adds to the year round fun for me.
When it comes to scouting, it's tough to beat a good satellite photograph, a compass or GPS, and a good set of boots in my opinion. Besides, I think that's the funnest part of the game.