We don't have an FR, but we do have a FR product and have hung lots of things in our fifth wheel. If it is very light, I will use Command hooks to hold them. If they are heavier, then I use a couple of the plastic anchors to hold the item tightly on the top and one on the bottom. Nothing has moved in a year and a half of travel and over 2K miles.
I will drill a hole in the frame of the picture, then a small hole in the wall, insert the anchor and then insert the screw, which tightens the anchor into the wall.