Welcome Mackie Forums Refugees!
Perhaps you missed the minor detail there are no floor monitors only IEM's. Compression for singers no way most don't have enough dynamic range to begin with.
I'm glad we agree on compression not being good for vox in general.
Just curious, is everyone in the band sharing the same monitor mix? If so, prepare yourself for a lot of dissent. It's highly unusual for everyone to agree on the levels "they" want to hear from the individual instruments, vocals, etc.