With the approval of the Secretary, the Commission may establish 1 or more real estate hearing boards. If established, each hearing board shall be a unit in the Department. If established, each hearing board shall consist of at least 3 members of the Commission, appointed by the Commission. Of the 3 mandatory positions on the hearing board: at least 1 shall be a professional member of the Commission; and at least 1 shall be a consumer member of the Commission. From among the members of each hearing board, the Commission shall designate a chairman.