Parallels uses telemetry. If a crack fails and the software phones home, your public IP is flagged. While Parallels rarely sues individuals, they actively audit businesses. If they find 100 seats installed with only 10 legitimate keys, the are treble the retail price.
Alternatively, deploy a .parallels_license file via MDM: parallels desktop business edition activation key top
To use a Business Edition key, it must first be registered to a Parallels Business Account Registration Process Sign in to My Account Parallels uses telemetry