the few that i've used i set on the fence where there were
slick spots where they had shimmied under and it works pretty good.
if you were not aware of it, snares are pretty much a one-time shot.
once the wire gets kinked up from a catch, they're useless as a snare.
i'm using traps now myself. they're re-usable pretty much forever
if one doesn't get dragged off or stolen.
be conscientious of scent as much as when you're deer hunting.
cheap snares and traps are truly a waste of money. learned that the hard way.
best advice i ever got about traps and snares was swivels-swivels-swivels.
good luck. kill as many as you can because you'll be lucky to make even a tiny dent