Is it allowed to show the label as a badge attached to the handle (which is at the front of the appliance), in contrast to being stuck on the front surface? 

If clearly visible, then attached to the handle (on the front) is sufficient.

_{Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.}