Looks like the only thing up for interpretation is "front and rear of the vehicle"
From the DOT regs:
§ 502.404. OPERATION OF VEHICLE WITHOUT LICENSE PLATE OR
REGISTRATION INSIGNIA. (a) A person commits an offense if the
person operates on a public highway during a registration period a
passenger car or commercial motor vehicle that does not display two
license plates, at the front and rear of the vehicle, that have
been:
(1) assigned by the department for the period; or
(2) validated by a registration insignia issued by the
department that establishes that the vehicle is registered for the
period.
(b) A person commits an offense if the person operates on a
public highway during a registration period a passenger car or
commercial motor vehicle, other than a vehicle assigned license
plates for the registration period, that does not properly display
the registration insignia issued by the department that establishes
that the license plates have been validated for the period.
(c) A person commits an offense if the person operates on a
public highway during a registration period a road tractor,
motorcycle, trailer, or semitrailer that does not display a license
plate, attached to the rear of the vehicle, that has been:
(1) assigned by the department for the period; or
(2) validated by a registration insignia issued by the
department that establishes that the vehicle is registered for the
period.
(d) Subsections (a) and (b) do not apply to a dealer
operating a vehicle as provided by law.
(e) An offense under this section is a misdemeanor
punishable by a fine not to exceed $200.
. 
