I use the vines like Jeff Sturgis on Whitetail Habitat Solutions uses for all his scrapes. They work fantastic. As for placement of the scrapes I will find the first flat opening on brushy ridges I think the bucks are bedding on. I like to keep them as close to a bucks bedding area as I can without feeling like I am pressuring the deer when I go in.
I will also transplant vines. I'll take a vine to a known area where I know deer will work it heavily. After a month or so I will take that same vine to a totally different area miles away and transplant it in a place I'm trying to target a specific buck. The foreign deer scent on the vine sparks heavy interest and I have bucks frequent the scrape more often than if I had just made an original mock scrape in that spot.
Also I hunt low deer density areas so when I move a vine that's been worked heavy in another area to a place with fewer deer, when a mature buck finds the scrape with so many foreign deer smells it seems to hold him in the area for a longer period...
I will also use rubber gloves and bag up deer droppings in ziploc bags from different areas and put the in the scrapes to make them look and smell more realistic...