Request

Hi everyone. I just bought my first home! Huzzah!!!! Problem is the base station that comes from Frontier gives me abysmal coverage now. I know back in the day we use to have WiFi extenders. And I have some experience in setting those up. But I know better options like whole home mesh networks exist. I'd appreciate any help in attempting to figure out which is the best; and what to buy. 

Some details: the new home is 2700sq feet. 3 bedroom. My wife and I have one child so far and he has a tablet. We both have phones and two smart TVs. The master bedroom is the furthest from the router and we loose all WiFi signal in the master bathroom. So far signal seems fine downstairs. I'd also like to have Wifi on the patio off the kitchen so I can set up some streaming speakers outside. 

So I'm not sure if I need 2 or 3 meshers or whatever they are called. Not even sure where to begin.

Thanks!