Yeah, the Apple TV would be my suggestion as well even if it's your only Apple device. Other than streaming service apps (Netflix, Hulu, etc...) I think the only app I've installed is Tailscale. It's a great device that is slightly more privacy respecting than similar devices from Roku or Smart TV manufacturers.
I've never owned a Mac before but now I'm thinking about getting one just so I can write software to run on my Apple TV. It's a pretty powerful computer that's tiny, silent, always on, barely uses any power, and is connected to my TV.