I have a new 2021 Compass, never strapped down. I installed the horizontal rectangular hatch.  I split the difference between the scupper holes and the drive.  The further forward the easier access but the standard bucket was 3/4 in to tall in the front.  I thought that this was too much to deform with a heat gun so I  cut a wedge on both sides and let the front edge  overlap.  Put three small screws on the front edge, sealed the seam inside and out with hot melt glue. I was afraid I wouldn't find a glue that would stick, but the hot melt really did the trick.  Now fits fine!