If the optical line from the TV is already used for the soundbar, the TV Streamer usually also has RCA connector option or stereo mini plug connector option or coaxial connector option that you can use to connect to the TV as well, if you don’t want to buy an optical splitter to share the optical line with the soundbar. Similarly to the TV streamer, the soundbar probably has those other connections as well (RCA or mini plug or coax). So you can pick one type of connection for the soundbar and another type of connection for the TV Streamer. I’d leave the optical for the soundbar, though, because you want to get Dolby or DTS sound to the soundbar via the optical. The other types of connection (except for the coax) don’t carry Dolby or DTS data, only stereo data, which is good enough for the TV streamer.