Easy print no supports required. This shelf is designed to suit Australian electrical wall plates, however I am sure the idea could be easily remixed to suit other countries standards.

There would be no problem to make the shelf larger to accommodate a bigger appliance and the back plate is thin enough in my case to use the existing screws that were already in use for the wall plate.

The only tool you will need to mount this shelf in most cases would be a screwdriver making installation simple for anyone. The beauty of this design as a renter is that you can have a shelf that doesn't require drilling any holes into the wall and can be easily removed when you leave.