Mercusys don't provide a figure for the range of the router, and as each home is different and there are many factors including construction and any objects placed within the home, we're unable to provide an accurate figure for you.
We have tested these routers and have used them for our residential and business customers without any concerns so far.
We're confident that the router should cover a standard family home, but if you have any range issues, you are welcome to use your own router if you wish, and we can provide instructions to get that setup on request.