Make sets in brushy or rocky areas. As with red fox and yotes you can set on edges of open fields and woods but grays like the brush more. Greys like to work a dirt hole set from the side so if you can block one side and put your trap on other side and put suttle blocking in front of dirt hole you should be set... the trap has to be tight to the right or left side of hole... this is my method , you can try differant ways if you want , just remember what works when you catch greys... there are videos, books out there on greys... buy some and study.. Good Luck