What about 2 slot ports separated by about 1"?
There's a vertical brace right in the middle of the cabinet. I can design that brace to come up off the bottom of the box to the height of the slot port.
This is a box for the smaller SEOS.
Notice that vertical brace. It could be used to divide the port in half, and then you could lay the top panel of the slot port right on there and glue it in place. All I would have to do is change the height of that brace leg to the height needed for the port.
I'm just taking a wild guess, but maybe two 6" wide slot ports that are 1.15" tall versus one 13" wide slot port that's 1" tall? What do you think?