My friend is moving into a ~3000 sq feet, 4 bedroom apartment. He has installed a 300 mbps Airtel connection that comes with a router. The challenge is that it does a very poor job of providing a good connection in other rooms and a simple extender fails miserablt too. He needs advice. Do you think a mesh will be a good solution. He cant make any changes or drills in the flat as it is a rented flat. if a mesh will be good then which is the cheapest thing which will work.