I use a strong stick to scrape away debris from under a licking branch--be sure to watch that you don't contaminate your area with your scent: scent-free rubber boots, rubber gloves, and just watch touching anything around you. Scrape to the earth and make the scrape in one direction. When it looks to be about two feet or so across, I then dig a hole a couple of inches deep in the center, place a little wax paper and on the paper daub James Valley Wall Hanger gel. I cover with some earth, drop more on the scrape, then daub more on the overhead branch. I usually make three or four in a line along trails.
I've heard folks belittle making mock scrapes, and maybe it has only been a fluke, but within a short time, I've had them taken over by bucks. Over the years, I have killed three decent bucks over mock scrapes...but, again, that may have been a fluke.
Best of luck, Arch