In your office, your going to be using them for backround music anyway, so no big deal. You probably won't be able to have ideal placement anyway. It will be as if you are listening to a concert with your back to the performers, that's all. Enjoy. Happy Listening.
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Obviously the response characteristics of your ears are different for sounds arriving from the rear, compared to those arriving from the front. Only you can judge how significant that difference will be for your purposes, and obviously the way to judge would be to listen to your main system while facing away from it.
FWIW, re computer speakers, I've seen very favorable comments about the Swans T200B (and its earlier predecessor versions), although they are NOT small, and I believe they cost upwards of $700.