It has 5 inch bolts that go through the mounting plate on the outside to a similar mounting plate on the inside. You want as much separation as you can between the two mounts, but mine had to be under the kitchen cabinet because of that window. 24" is plenty of separation according to the manufacture. Since I was under the cabinet I added 2 X 10 hardwood under there (as much surface area as I could) to beef up the outer wall to handle the load. I also tied in the cabinet frame and the floor which brought in some vertical framework from the MH outer wall into the structure.
2017 Sunseeker 2250 24' MH