Put my set on Vw t5.1 combi single slider the weekend,my set also sits on the rubber like your photo.
Also the instructions are incorrect for the tail gate as the t5.1 is fixed by 4 x long tec screws and the t6 is 2 x long screws and 2 x short screws.
Have contacted them to inform that it is incorrect on the documentation and on the video on line .
Was expecting a more OEM fit for the price ,but looks better than the curtains before.