Holden Beach is all on the Island. Just easier to explain where it is instead of trying to give directions from Supply or Shallotte.
Keep in mind the heaviest rainfall is project to start Saturday afternoon. Landfall (Half as of writing this) is just the appetizer with this system... and again, a lot of areas that are going to be affected were drenched before this storm even formed (Wind is irrelevant with the $$$ billions this storm will cause).