Bookshelf speakers that sound good on a SHELF or SIDEBOARD

Signature Ones will not work well in a tight space. Totem recommends a minimum of 1 foot from rear walls but anyone that's owned Model Ones knows they need at least 2-4 feet. 

Focal Aria 906 on ISO Acoustic Aperta 200 stands would be my highest recommendation anywhere near that price point.

Get sealed cabinet speakers or good headphones. 

I would recommend a front ported speaker.....or sealed acoustic suspension like Helo mentioned,  but not many small speakers aren't ported.

In this same situation I have used both Rogers LS3/5a (also available from other manufacturers as noted by yogiboy) and Allison CD-6 (available on the used market from time to time, but you must be patient). Price points are very different including the variations of the LS3/5a. ZuAudio also makes a couple of speakers for this purpose - Cube and OmenBookshelf; but I have not heard either of these.