Can you do it? Sure. Will you get good sound? Probably not. Most people set their speakers 3-4 feet from the front wall and have the subs much closer to the wall to avoid getting boomy bass.
All the best.
Bookshelf Speakers Sitting On Dual Subs?
I have a couple excellent subs - Elac Adante 3070 - which have pretty effective DSP. I'm thinking of buying the Dutch&Dutch 8c (also DSP). The Elacs are rock solid. I'm thinking about placing the 8c on IsoAcoustic stands on top of the Elacs so the 8c is even with the front of the Elacs and separated by the Iso stands: running the DSP for the subs and then the 8c. Any real drawbacks to this set-up?