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They're front-vented, so whilst I wouldn't consider it with the older speakers I had which were rear-vented - it may well work with these.
I will at least try it before ruling it out.
Why? Because right now they're probably too close together. And midway to the wall from where they are will just make 4 cupboards useless. If they do work in the corners then it will be neat as all cupboard will be accessible and the sound stage will be nice and wide.
why would you put them in the corner of the room? goes against all the known acoustic issues with room/speaker placement.