Part 47 rules copy and paste
47.113 Location of marks – heavier-than-air aircraft
(a) Except as provided in paragraphs (c) and (d), aeroplanes, gliders, and powered gliders must display the marks required under 47.101(a)—
(1) once, on the lower surface of the wing structure. If the marks are confined to the outer half of the wing structure they must be located on the left lower surface. The tops of the letters must be towards the leading edge of the wing and so far as is possible, be equidistant from the leading and trailing edges of the wing; and
(2) horizontally on both sides of the fuselage between the wings and tail surfaces, or horizontally on the upper halves of the vertical tail surfaces. Marks on a single vertical tail surface must appear on both sides. Marks on multi-vertical tail surfaces must appear on the outboard sides of the outer surfaces.
However further on in the rules:wings markings are not required if the aircraft is flown wholly within NZ