in any case, "staan". But only if the plates were neatly arranged in a plate rack, and they were all 'standing', as in this picture: https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.t0KJtkDwvU7T4WzdSfzG-wAAAA%26pid%3DApi&f=1
Here we need to use the right form of the verb zitten because as the plates and the cup are in a cupboard, they are inside something, the cupboard is like a thing that contains them.
not only, I had more in mind a mug. Mrs Bucket regularly offers one to her neighbour because she tends to get so nervous that always ends up dropping her china. And she always calls these mugs "beaker" (I'm referring to a TV show from the 90s, Keeping Up Appearances)
I was actually thinking more of something like this: http://www.ebay.com/itm/Orginal-Welsh-Beaker-Collie-Mug-/272471014668 or this: http://www.ebay.com/itm/Buckingham-Palace-England-UK-Mug-Beaker-4-5-/110862420901
I tried finding on youtube a video with that specific kind of scene, but I couldn't. But I guess is you just watch any episode as soon as Hyacinth invites Elizabeth to have tea, you'll get to see it. She invariably ends up asking her if she wouldn't rather use a beaker (and offers her what most people would call a mug).
(sorry, I have no idea how to post pictures here :P )