yup, it's quite easy to base their positioning on the press photos (in my case i based it on the photos printed at the back of the box). what could be the biggest concern is matching the swords to the right ringwraiths.
one ringwraith, the one at the back, to the right, would get the sword with no handle. the wraith in front would get the sword without any spikes, and the 3 remaining swords would go to the rest of the wraiths. these swords are made of metal, maybe bent in the packaging but can easily be straightened, and are formed from the same molding so any of the 3 blades can fit to any of the 3 wraiths. you must be cautious though, as you might need to exert a bit of an effort in putting those pegs into the robe holes. the holes are a bit tight.