Hmmm...I have two smaller tables behind my couch that serve as my imaginary console... (I can't afford one now, so these will do)
They are about 2 inches shorter than the sofa and look great.
I don't know that I would go higher...I think it would look rather odd from the front view to have table showing behind the sofa.
HTH
...High expecations are such trouble-makers...http://www.confessionsofthecaffeinated.blogspot.com