Extending RBS20 with plug in satellite

I have an orbi mesh network with the router and three satellites. (our house is two stories 5300 sqft) I am rennovating a room above an attached garage and the WIFI signal is not strong enough to connect with a smart TV. There is an existing satellite with solid connection on the second floor positioned at the end of a 30 foot hallway that leads to the new room. What's the best solution to extend the nework? Another RBS20 satellite .. a plug in satellite or other?