Tow Bar bumper cuts - L538

Does anyone have a Westfalia or TowTrust detachable towbar on an L538 with Dynamic bumpers?

If so, please could you take a photo of the bumper from the ground up showing the cut needed. I'm keen to have as small a cut as possible. I've tried searching around the forum but have not managed to find one showing where the bumper is actually cut.

I'd be interested in other brands if there's one with a smaller/no cut but from what I've found so far, it comes down to Westfalia or TowTrust.

Thanks in advance.