I recently did a den with a vp100 and M2s as surrounds. Den measured 10x13x9.
Homeowner was on a tight budget so M2s got the nod. They also went with a $500 receiver.
She is happy. He is dissapointed. Even with dual subs.
I would go with M3s and vp100 with a denon x2700H. I have installed this package as well and that homeowner enjoyed a much fuller sound. The M3s and x2700 are a great match.
Here is the room that worked great! No sub in this room either. They didnt want one in this space.
https://www.axiomaudio.com/boards/u.../family-den-and-deck-with-axiom-on-board