I have a  satellite network  (called "Home") and a very slow dsl network (called "family") which we switch back and forth depending upon what's working best. 
 

we have a 3story house with horrible speeds everywhere, but after connecting one TPlink router to the modem on middle floor and another in the dining room (above "home gym" in the basement) get WiFi downstairs for first time ever.

our dsl modem is on top floor and we'd like to connect a different mesh system to it so we can get dsl to the basement, too. 
 

how can I set up to standalone WiFi mesh networks through the house?

thanks!!!!!