How well does it work?

Lets say i want to play n64 games that support local multiplayer and i play it via emudeck. I then connect the steam deck to my tv and then what?

Does connecting 2 controllers to the device work well and does the fps still stay at a good spot even when connected to a 4k tv?

I tried googling this but somehow i find very little info on emulation + local multiplayer with the steam deck.