Smudge is right mate.Any paths, rides, deer paths,gaps in fences,gateways,,field edges,hare runs,literaly anywhere.I set my snares between 10-11 inches high with a large 10-11 inch loop.Look for tight spots on the runs where theres some longer grass,bramble,saplings,nettles to allow your snare to really blend in.
Spray your snares green for camoflage.Set em using 3mm galvey wire as your tieler and eletricians tape to fix the snare to the tieler.
I use mainly drags on my snares so the runs stay untouched enabeling me to reset the run.