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That is pretty high end. Can you get permission to change the room so it works? Would be a lot cheaper and more natural a solution.
I'm a big fan of DSP and it's got very good these days. Natural solutions would always trump it IMO though. If you're really not allowed to move the furniture and create a listening position that works then DSP might be the only/best answer.
Dirac is a very popular version that's supplied in boxes like the one you linked to. Correcting IR and EQ.
On a simple level you do understand the massive glass cupboard in the corner of the room might function as a very unusual resonator.
so now I'm thinking about one of these
review: https://www.avforums.com/review/dspeaker-anti-mode-2-0-dual-core-review.355
thoughts?