I am attempting to set up a mesh network in my 2200 sqft home that will also extend out to a detached building approximately 100-120ft from the house. Right now I'm using an AC-1750 router and have no other hardware. What products will best be able to provide the coverage I'm looking for? Specifically, this detached building is used as an Airbnb and will need speeds fast enough to stream video on 2-3 devices. 

Thanks!