According to your web site description these are wall plaque. One would assume from this description and picture that they sit flat on the wall like the house number plaques I've purchased from Wayfair in the past.
These plaques have four small feet on the back where small rubber bumpers are attached. This makes the item sit a half inch from the wall.
This not what was expected when purchased. May I suggest you post a photo of hanging plaques so future customers can see that they do not sit flat on wall when hung.