No holes so you're good to remove.
On the fenders there are screws on the inside of the wheel well that hold the flares on to the vehicle, 5 or 6 of them... no exposed holes on body of vehicle.
On the door, the flare is attached to 4 clips which clips to the door. The doors have a tape like material that the clips slide on to, to protect the paint. Again, no holes.
I just removed mine last week. Keep in mind that once you remove these flares, there's a good chance you'll be able to see the outline of the flare in the paint due to exposure to the elements.. sun, dirt from road, etc. You may be able to buff this out but I wasn't able to on mine.. so I left them on, removed the boards and am re-painting the flares.
Good luck.