Removing fake listings on Google Maps and making sure that GMB listings adhere to the guidelines so that they do not get a ranking advantage is an important task to perform periodically.
Local Falcon makes this task extremely easy. You can easily see where your target business is ranking just out of the 3-pack (first page of Google) and focus your time on checking those areas for listings that do not adhere to Google guidelines.
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Google My Business Guidelines: https://support.google.com/business/answer/3038177