Just picked up a new FireTV 4k Max because I heard it was the perfect device for emulation, and it is. And fairly cheap. I had been running emulators on an older firestick but the new one has much better OTG support and will recognize USB storage without mounting via Adb. RetroArch and many other standalone emulators are available on the Amazon store so you don’t even need to sideload the apps anymore.
Ive tested up to PS2 and barring a few known titles it’ll run pretty much everything. N64 included.
Amazon have stated they plan to drop Android on their sticks in the future, and switch to their own OS which I doubt will support these kinds of uses, so grab one while you can.