I have just made a cabinet (hence earlier posts about hinge cutter bits).
Now I have come to mounting it on the wall, I was going to use the modern things that most kitchen cabinets use - apparently called Suspension Mounting Fittings [1]. But, alas, I had not thought it through. These require the fitting to be mounted approx. 15mm or so in front of the wall. Which, if you have a false back in the cabinet, is fine. I don't have that. Because the cabinet is very shallow already, I decided just to inset a bit of thin white faced MDF/hardboard into the back. So I really have just about 3mm.
So are there any similar devices that work in the siuation I have described? The adjustability is so nice! The load is nowhere near the same as a laden kitchen cupboard so a light device would probably be fine.
[1] If I have not explained clearly, they are shown here. I have used these very ones very successfully for cabinets with real backs.