That pioneer receiver is not an Elite model - it's a standard line one...you could get away with doing the 819 model as well, but the 919 has multiple hook ups for all of your components and would work a lot better.
The Paradigm speakers are 7in tall x 4 in wide x 5 in deep. You can fit them pretty much anywhere.
Some random in-wall speakers my house came with
Xbox One (GT: Redfox29311)
All the Monoprice wires you can find