Took a couple of pictures to help. The B did not have the vario floor and I susppect if it did whole process woudl be easier as you could just leave the floor on the higher setting and it be fine.
In my case with the space server the floor still shuts fine flat but had to remove the clip hook as it hit the tyre and was useless anyway as had nothing to clip to as the trim was removed in that area from the boot lip. Still it fitted well and no rattles or movement