The east part of Austin where Tesla is located is still underpopulated compared to most of Travis county, so there's room for a lot of housing to be built out that way. Connectivity from there to central Austin isn't too bad, since that's the direction of the airport and Houston.
No, when setting up the TV, if you choose not to have a network connection, there is no need to link. There wouldn't be a way to link, as the TV can't reach the Roku servers.