I travel in places where the internet is very patchy and frequently non existent, so streaming wasn't really an option. I've never had Sirius cut out on me unless I'm in a tunnel or parking garage. Even then in major cities (like NYC), they have terrestrial signals that work in buildings and tunnels, so you stay up there too.
Running the antenna on the dash was a consideration, and was "plan B", but I prefer it to be outside, if possible. Ideally, antennas want to be sitting in the middle of a broad, flat, metal surface. Typically, you use the roof, but the closest thing in the Y was the trunk. The dash is probably fine in most cases, but the trunk should work just a bit better.
I don't find the aesthetics too offensive, especially since the wire is completely hidden. It's in the back, right by the window, and it's not a show car or anything.
Mainly, just posting this in case there's anyone else out there that really misses having Sirius in their Tesla, and giving them options.