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^what he said.
I know everyone thinks that their solution is worth sharing but; I have some old Celestion UL6s on 30cm deep shelves that I use as nearfield monitors. They're only 20cm deep so can sit angled in on the shelves. No rear port (they have a passive "bass radiator") which means they're okay with the back facing a corner. Very open and three dimensional. Best speakers I've ever had anyway. Love them. https://www.lencoheaven.net/forum/index.php?topic=13368.0
Dooks-Fatberg-
I have some old Celestion UL6s on 30cm deep shelves that I use as nearfield monitors. They're only 20cm deep so can sit angled in on the shelves
These are my favourite looking 3-ways. If I ever find myself in a "they didn't make them like they did in the olds days" I'll have these in mind. This is the format that makes sense for bookshelf speakers.
Velocio
Of course it's possible, but both those examples are specific applications where dimensions are more important than acoustics. I'd guess in most rooms the depth of a stand mount speaker is rarely a problem.
The problem is semantic really, these speakers aren't designed to be on a bookshelf, just everyone calls them that.