I've had amazing success with vertical rub trees (rub or scrape tree, whichever term you prefer) out in the open. As Steve B says "Turd in a punch bowl". Put one in a food plot and the deer can't resist checking it out. But the same setup in a wooded area has had zero success.
I'm hopeful a horizontal rub tree in a wooded setting will work better. Hope to find out this year.
-John