Rener Gracie used to wrestle in high school. He's brilliant in BJJ but only 'pretty good' in wrestling because he constantly had to fight his instinct to pull his opponent into his guard lol
Grappling would be dangerous fighting multiple opponents, true... you're completely exposed to guy number two while you're trying to disable guy number one. Maybe Muay Thai would be a good thing to know in that situation.
The best thing when faced with multiple opponents is to run like hell
