Nope they are not, but they would be if you were to attache separate reflectors somewhere else on the back of the car
a car reflector has to be:
if there are two, an equal distance from the centre of the car.
if there is just one, somewhere on the centre line or to the right as you look at the back of the car.
Get a quite large rear numberplate holder made out of red reflective plastic, then you won't need another reflector!!
0-60 in 6.5 secs and 48mpg- winner!