Amazon’s Fire TV Omni series isn’t known for impressive picture quality — the black levels are so-so and the color accuracy isn’t great — but they do offer some nice perks, including an HDMI 2.1 eARC port. It also has built-in mics for hands-free Alexa voice commands even when the screen’s off. Unlike the smaller configurations, the 75-inch model also includes support for Dolby Vision HDR. That’s in addition to a low input lag, support for two-way video calling, and, of course,…