The only figures I could see casually were that there were approximately 2,000 per year in England during the reign of Henry VIII...so I guess it's not insane to imagine a mid-size town in Germany having 10 or 15 a year? Which would surely be enough to justify professional help?
Beside actual executions, there were torture as a part of crime investigation (in particular to extract confession as the religion insisted that criminal must confess to make sure that no innocent gets punished), plus non-capital punishments:
"During this time, he executed 394 individuals by various methods, and also flogged, disfigured, or tortured many hundreds more."