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12mm is very thin. Those spring stays work and they don't take much space. I'm not a fan of the action though. Usually they like to snap shut as they have no damping. It's not really a problem, just not very refined.
They do another one 372.91.720 which has a soft close but the Hafele list price is £27.60 per pair, that's probably ex. vat too. There are loads of hardware places that can order Hafele stuff direct.
If you look in their catalogue, search for "flap" there's loads. Loads of flaps.
I'm making three overhead storage cupboards above some fitted wardrobes, each approximately 1000mm x 200mm. Front flap will only be something like 12mm mdf, what sort hinges should I be looking for? These look a bit cheap and cheerful, not that I mind but I want them to actually work... http://www.screwfix.com/p/hafele-swing-up-stay-nickel-50-x-150mm-2-pack/5084p
Picture of the space...