Slow Feeder ?

I adopted my jindo mix a month ago and, unsurprisingly, she is almost the complete opposite of what her foster family shared. One of the biggest differences is her eating habits. They noted they fed her twice a day and she would leave about 30-40% of her food in her bowl. While I also feed her twice a day, she CLEANS her bowl within minutes. I’ve been thinking of getting her a slow feeder but since she’s my first dog, I wanted to get some advice on if she would need it or not.