I’m actually using an old Android I had laying around and collecting dust (Huawei P20 Lite), battery was pretty much flopping, but as a Linux user tried to give it a second life and made a sort-of Android TV box of it.
I installed a TV launcher and 2 main apps (SmartTubeNext and Cloudstream), then connected it to my main Linux laptop through cable and run a program called scrcpy which let’s me duplicate the image/audio to a separate window in my laptop. Cheap and dirty, but it works flawlessly.