Center channels are essential for proper home theater. It centers the image perfectly no matter the seating position and two channel audio has a real problem, with a perfectly centered image. The reasons are many and probably beyond this thread. Some people here don’t understanding theater audio and have some interesting but ill informed opinions on the subject.
There is nothing that I am aware of that is a perfect speaker for a bad room, but looking at your setup, you need a speaker without a rear port, as a bare start. Acoustic panels for the front wall are inexpensive and can help a lot.
What is your budget? We need a starting point. $30K omnidirectionals may be perfect for you, but way outside your budget. I do expect, based on your picture, that small book-shelf speakers on stands placed a practical distance from the front wall with 2 or more subs (not 1) will be close to what you want. We may able to work with what you have already.
I would be inclined to keep the Dali's, learn how to build acoustic panels for behind the speakers, and invest in more subs.
There is nothing that I am aware of that is a perfect speaker for a bad room, but looking at your setup, you need a speaker without a rear port, as a bare start. Acoustic panels for the front wall are inexpensive and can help a lot.
What is your budget? We need a starting point. $30K omnidirectionals may be perfect for you, but way outside your budget. I do expect, based on your picture, that small book-shelf speakers on stands placed a practical distance from the front wall with 2 or more subs (not 1) will be close to what you want. We may able to work with what you have already.
I would be inclined to keep the Dali's, learn how to build acoustic panels for behind the speakers, and invest in more subs.