Sorry, thought the diagram might work. Will try alternate method. Thanks anyways. Dave
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First I think you are being very smart by looking into acoustic treatment.
I would recommend a diagonal setup because you almost have square dimensions. This will give you the best results (I know from experience). However, it is a trial and error process since you won't find a lot of information about it compared to the typical placement.
You can go to Michael Green Audio, Eighth Nerve, or others (or DIY) and get a floor stander to put in the space where it opens up to the dining area. This will simulate a wall and will help give a better soundstage.
I can't validate the results, but here is a link to an article by Steve Deckert of Decware concerning diagonal room placement.
Go to the Decware site at:
Click on "My Room" then scroll down to "How to set up a room with no treatment". The article is about diagonal room placement.