If you have a listing without reviews, that's a bit useless because customers always want to know more about your business. But if they don't see any reviews, they definitely won't take it as a trustworthy listing, so for great results, you must add bulk great ratings, take short time gaps, and put the niche-related keywords inside the contents.
Having a HIGH NUMBER of POSITIVE REVIEWS from Real customers can improve your business's visibility and reputation online. It shows that you are trustworthy and reliable. And that you are committed to providing excellent customer service.