You do have to open it with a connection to update, say you change days around, update FTP etc.
I run TR on a Android TV box. TR say it’s unsupported, but Play Store allowed me to download it, and it gets updates. I hadn’t worried about leaving it out there, but actually went and brought it in after your post!
One of the reasons I went firestick is you can connect by ethernet, but I’ve better reception in the my shed than the far end of the house!
Here’s my (functional) set up. Have an old computer table where my daughters bike is in this photo now - that holds remotes, drinks, tissues, gloves etc.