DON'T DO IT!!!!!!!
I CAN'T BE MORE EMPHATIC!
you cannot hide the fact that this device is fitted to the rear of your bike. once fitted this shows an act of premeditation a "MENS REA". Thus your bike is now actually suspected of committing a criminal offence even if you have never done so..
they are totally illegal and if fitted to a bike and discovered the bike is seized and you face criminal charges, not minor road traffic infringements
ie speeding ticket 3 points and £60 fine..
fitting a "flipper" 10 points a years ban and 2 years imprisonment.
There are more effective ways of moving your numberplate position so as to avoid minor infringements that will attract less attention.