TOTALLY UNTESTED, I will be testing in a week or so and will update.

3m command strips,when applied correctly seem to be able to hold a huge amount of weight when stuck to suitable surfaces, such as the melamine found inside kitchen cabinets.

This bracket is designed to stick to the inside vertical surface, have a shelf sat on top and the tight fitting of the shelf should make it pretty strong as the strip wont be able to peel off.

It is designed for the small strips but can of course be scaled. Or I can scale or redo if anybody wants a different size.

I put 3mm screw holes in, in case anybody wants to secure it. They are not countersunk.