I am afraid I don't have good news for you with respect to your desired seating ...
I wound up moving one of the subs to the back of the room. There was a black hole at the primary (front row) seats at around 34 Hz, which I determined to be quarter wave interference from the back wall.
The only way to eliminate it was to move one of the subs away from the front wall. I didn't want it in the middle of the room, so it wound up in the back, where it would be less noticeable.
They aren't centered, because I couldn't fit the tall cylinder in the middle. It doesn't fit behind the screen or under the screen, so it would block the screen if I put it in the middle. I did a number of iterations with one sub on one side of the screen, and then moving the other sub around the room. The best I found - both subjectively and also analytically - was front right and back right. Here is the front position:
Notice the sub is on the right side of the screen, and there is still a "pocket" in the wall on the left where I had intended the other sub to have been. Then in the back right, here is the other sub on the riser in the back corner:
I will opine that I really do enjoy this positioning. I had some limitations, too, but I feel the acoustics work well. I don't have a chart to show you of final acoustics in the room, but I am very happy with where my subs wound up. Maybe a back corner position would work for you, too? That might help you with your seating choice.