I'd recommend the
Weather Tech Bootliner.
There are a number of pictures on the link above. Sure, it's expensive but it's a lot better than any of the VW OE accessories.
It's sufficiently rigid that if you have debris or spillage on it, the sides are high enough to contain it and the material isn't so thin that when you go to lift it out to clear, it collapses in the middle and dumps the spillage all over the interior.
I have one in black and one in grey in our cars. Happy to take a few pics if you wanted to see some images of it 'in the wild'.
The other thing that's quite handy about it is the vinyl clip in bumper protector. It anchors in well - it helps stop our dog clambering over the bumper and keeps muck off your legs in winter if you have to lean into the vehicle. It's a laminated canvas with press studs that anchor onto the mat itself. Easy to clean and braided edges so it doesn't deteriorate.