Main TV: Switch, PS4, NES Classic
Second TV: Switch, PS3, Wii U, SNES Classic
Third TV: GameCube, N64, PS2
I also have a PSVR that'd be plugged in if I had a good network environment for PS4 remote play.
If I can, I want to eventually get rid of the PS3 and PS2 (there are a handful of games I go back to like DDR, Katamari, Demon's Souls, and PS1 classics) and I'd really like to see a N64 Mini just for the space-saving potential (I doubt it'd have the games and features I'd want, though). At that point, I think I'd be at my sweet spot for consoles on deck.
edit: this isn't counting GBA x2, DS Lite x3, and 3DS x4