There’s a handful of lakes in the metro that I’ve caught limits out of (I don’t keep metro eyes, though). There’s a lot of research and a lot of trial and error involved, but those lakes do exist.
Most people like me are very very tight lipped about these spots because we’ve seen what happens when word gets out (Think City Hall Pond in Inver Grove Heights about a decade ago)
My best advice to you is to always have a second line out to maximize your odds (dead stick, Ifish Pro, tip up etc) because that’s how I catch most of my walleyes.
Best of luck to you.