In addition to the poll managers appointed pursuant to Section 23-15-231, for the first five hundred (500) registered voters in each voting precinct, the election commissioners may, in their discretion, appoint not more than three (3) persons to serve as poll managers of the election. The election commissioners may, in their discretion, appoint three (3) additional persons to serve as poll managers for each one thousand (1,000) registered voters or fraction thereof in each voting precinct above the first five hundred (500), not to exceed six (6) additional poll managers under this section. Any person appointed as poll manager shall be a qualified elector of the county in which the voting precinct is located.