If you want to fight the front plate for the sake of $375, it must be legible from 45° in all directions (
http://www5.austlii.edu.au/au/legis/...725/s30.html):
TRANSPORT OPERATIONS (ROAD USE MANAGEMENT—VEHICLE REGISTRATION) REGULATION 2010 - SECT 30
30 Position, visibility and legibility of number plate
(1) The registered operator of a vehicle must ensure that each number plate issued for a vehicle is permanently attached to the vehicle so that, if the vehicle is on level ground—
(a) the number plate is—
(i) in an upright position parallel to the vehicle's axles; and
(ii) not more than 1.3m above ground level; and
(b) unless an accessory plate is attached to the vehicle in the way required under section 37—the characters on the number plate are visible from 20m away at any point within an arc of 45deg; from the surface of the number plate above or to either side of the vehicle, in the way shown in figures 1 and 2 at the end of this section; and
(c) any cover on the number plate—
(i) is clear, clean, untinted and flat over its entire surface; and
(ii) has no reflective or other characteristics that would prevent—
(A) the successful operation of a photographic detection device; or
(B) the number plate from being legible; and
(d) the number plate is in a clearly legible condition, including being clearly legible from any position from which it is required to be visible.
Maximum penalty—40 penalty units.