The Atlantic Technology products I linked are not powered soundbars, but are instead a combined L/C/R solution. One of them has the enclosure subdivided into 3 chambers. While they are still a compromise by design... they seem to be a much better option than a standard soundbar you see from Vizio, Polk, ect...but probably at alot of added expense.
I don't know anything about the Aperion product, other than they are working on releasing it soon.
Like I said... if it were me - I'd find a way to make it work with traditional speakers. I was only giving other options for the OP since he is restricted to placement on the TV stand only. I'm not saying I recommend them, since I've never heard them personally... just presenting him with the option. He'd have to look elsewhere for opinions/reviews.
That said, erniec made a good recommendation, which I can't believe I didn't think of - the Energy RC-Mini would be a good upgrade in SQ and still provide easier placement than larger monitor/bookshelf options. Placement would still be closer than ideal though...
Two RC-Mini Centers oriented vertically at the front corners of the stand is probably alot better, and WAY cheaper than the Atlantic speakers. I recommend the RC-Mini Center over the bookshelves because they extra woofer helps with some bass extension, and would allow the OP to use a 100-110Hz or so xover insted of 120Hz or higher... This relieves the sub from having to play some of those higher frequencies, and helps with bass localization.