There are so many fox traps out now it's hard to see what's best
I make a few diffrant types for farmers and games keeper
Fold away ones I think are not good at all
Mine are tied together with 12g wire and tacked in areas that take a bumping , I also make mine two inches under the door so they can be bedded in to the ground.
A farmer I know had one off me 6 years ago and we dug it in and made it a perm sett 6 years on its stil in same place and accounted for a lot of catches
Just make sure when it's not set pad lock door open