That's what I do as well, and it's fantastic. Bonus functionality: Get MPV to always open on the second screen fullscreen (if you have one) and have it be alway

That's what I do as well, and it's fantastic. Bonus functionality: Get MPV to always open on the second screen fullscreen (if you have one) and have it be always-on-top, small and on the bottom right corner when non-fullscreen, so you can just press Esc on the full-screen mpv window and get a PiP-like window.