This is good advice if you already have stiff HDMI cables. If you’re buying new cables, I can highly recommend. Monoprice Ultra Slim series.
Check this post (and video) in the other streaming thread. That’s the first-gen Magewell Director.
Edit: If @reclaimarcade is running the same setup, here’s a newer video of an actual tournament: https://youtu.be/hPAMFtyvBoM