@signaforce I think you’re partway there with the couch if it’s in front of the first reflection points for each of the speakers. if you’re saying head high when you’re sitting you might want to add some panels (2 x 2’) on top of the couch while you’re listening. Those are really easy to put away.
There is only one way to determine if that is the best corner in which to put the bass trap and that is to listen there and in the alternative spaces. I imagine no matter what corner, you’re getting some benefit although there is a possibility a lack of symmetry may hurt you. On the other hand, your room is already asymmetric. Only way to find out.
And thank you. I can listen for hours on end.