Every holder of a license as a funeral director shall display it, or a copy, in a conspicuous place in the licensee’s place of practice or in the place of practice in which the licensee is employed or contracted. If the licensee is engaged in funeral directing at more than one place of practice, then in the licensee’s principal place of practice or the principal place of practice of the licensee’s employer and a copy of the license shall be displayed in a conspicuous place at all other places of practice. Every displayed license shall have the license number visible.