I have a Mac mini Pro M2 with some extra RAM, memory and GPU power. It automatically defaults to the 4K setting and works really well for Zwift. Way better than Apple TV4k. I use an HDMI cable from my computer to my smart tv and it works well. My heart rate monitor and Tacx Neo smart trainer both work with bluetooth without any issues or need for anything extra.
I have a Mac mini pro m2 (with extra power, etc) and it defaults to the 4K setting. I just started using it a couple of weeks ago.