A modular point-of-sale display comprising a plurality of inter-lockable display units comprising a primary display unit comprising a primary multi-panel structure comprising a plurality of primary product display apertures configured and arranged to receive a plurality of first products for display a hanger element for mounting the primary display unit to a support structure; and a primary mounting element; and an add-on display unit comprising: an add-on structure comprising a plurality of add-on product display apertures configured and arranged to receive a plurality of second products for display; an add-on mounting element configured to mate with the primary mounting element to hang the add-on display unit from the primary display unit.