The more ya set the better your odds of catching them,i do not like anything above or over my snares if i can help it,hard to do sometimes in thick areas.
Deer will duck their heads under them sometimes,dont ask me how i know this.lol
They are lots of fun to set free.
If you are setting on a good trail walk it and set 2 or 3 along it.
Like i said most areas you should be able to set without anything being above your snare,if u are setting in a thick area just trim out any limbs that would be above it so as not to make deer duck under and get caught.
Trails cutting across fencerows are great spots also,if it is wide enough set one on each side,good way to catch a double.
Also you dont have to worry about putting any sticks beside the snare to guode them through it,when they are cruising a trail they are on the move and pretty much stay right on the trail and run right into the snare,u wanna make sure your snare is just hanging on the guide wire so it just slips right off when they go into it,if they are cruising slow and feel it on their neck from any resistance they will back out.
Feb and March are great times to catch some doubles as they are breeding and running in pairs alot also the males are on their feet and covering lots of territory searching for females.
Good luck it is lots of fun when you start catching them.