what Tracy said. If you know they are using a specific trail but not sure which direction they are mostly traveling, just pick a spot and clear all the leaves and debris away down to the soil. The tracks will tell you. For does it really doesn't matter, but for bucks I like having them walking towards the camera.
As others have said it works much better to place the trail camera where they are spending most of their time. If it's thick cover, not usually this time of year, but either way you have to go to them.