toot, I don't have a clue on the percentages of the community, but an over whelming number of the guys I've hunted with over the years shoot off the shelf.....like over 95%.
Proper brace hieght, nock point, proper arrows etc will keep your fletching from riser contact and your won't have any kick issues.
If you do want to shoot plastic vanes, an elevated rest will likely be best....from what I've 'heard'. I really don't know cause I've never fooled with vanes or a rest.
Best of luck to ya either way.