Rear port of not, you will always get reinforcement from the front wall, and almost no acoustic panel will fix that. The acoustic panel helps reduce higher frequency reflections that screw with imaging.
You main couch is a long way from the speakers. I would prefer speakers farther apart and then add some reflection control on the side wall(s). You need the center channel for that couch on the right wall.
Speakers don't fix bad rooms, but some can mask them. Omni-directional can work well. Speakers with a narrow emission pattern can work well. It is a far better investment to treat the room. If you DIY it is inexpensive. The other trick is multiple small subwoofers. You may not get the super deep bass of one large expensive sub, but you will have much better bass for everyone.
You main couch is a long way from the speakers. I would prefer speakers farther apart and then add some reflection control on the side wall(s). You need the center channel for that couch on the right wall.
Speakers don't fix bad rooms, but some can mask them. Omni-directional can work well. Speakers with a narrow emission pattern can work well. It is a far better investment to treat the room. If you DIY it is inexpensive. The other trick is multiple small subwoofers. You may not get the super deep bass of one large expensive sub, but you will have much better bass for everyone.