Ko ngā peera pōro pana-rua he mea hanga ki tētahi horoi pou, ki ngā horoi whare e rua, me ngā huihuinga pōro-whare e rua. Kei waenganui i ngā whare e rua tēnei horoi pou, kia taea ai e te peera te kawe i ngā kawenga tuaka i ngā taha e rua. Kei roto i te whare ngā pōro, ko te horoi nohoanga whakarārangi kua whakahāngaihia te arataki i a rātou.
