To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Our shelf turned out to be extra-thick so these didn't slide on all the way. Likely a unique situation but worth double-checking. We cut off the hanging arms with a hack saw and turned them over to use them as shelves - enabled same storage just reverse.