You will need to land a receptacle up there and a jumper speaker cable between speakers if I remember right along with input feeds. The built in amp in the computer speakers is great for closeup listening but I'm not sure how it would hold up with a dynamic Atmos mix at further distances. Its 75w if I remember correctly.

I would recommend doing it right and buying another power amp for your fronts and assigning the free AVR channels to surround duty. Buy used to save $ and get something substantial. cool The gear in the rack can be sourced locally to save dough.