My company did a series of concerts with the Men of the Deeps about 20 years ago for the Red Cross. They were mostly held in churches, and we did the PA and lighting for the shows. I didn't work the concerts myself, but just messaged with the guy who did sound for most of them. He remembers using 6 PL-11 mics (dynamic, hyper-card) as overheads on the choir, with the band and soloists being conventionally mic'd. The trick seems to be to get the mics close to the choir, and then use a lot of them, so nobody's voice in particular sticks out. It's not a traditional recording setup by any means, but for PA, it gets the job done on the same stage as the [well behaved] band.
There's nothing particularly special about the PL-11s, I just happened to have 6 of them. The response isn't hyped like most vocal mics, but as long as you have a bunch of the same thing, you can EQ them as a group.
As the others have said, they're a great bunch of guys. They are actually all active or retired coal miners, so there's no room on the stage for prima donnas.
GTD