So do mine, however I have replaced them with genuine Audi rubber mats that don't and you can feel the fastener protruding through the rubber which is a bit weird...
Been doing some research regarding genuine Audi rubber mats for the front and rear of my A3 saloon, and have been informed by my dealer that there are two part numbers for the rear mats:
8V0
061 512 041 - Rubber mats, rear (Sportback & Saloon) - Fastening type: With no securing points
Remarks: Pollutant-free rubber compound
8V5
061 512 041 - Rubber mats, rear (Sportback & Saloon) - Fastening type: 2-point fastening
Remarks: TPE mats (plastic). 100% recyclable
As you can see, the second set have securing points, though I don't know if they are in the same position as the original carpet mat fixings. Also, they appear to be TPE plastic, but not having seen them, I don't know how close to rubber this material is?
The front rubber mats for the Sportback and Saloon have securing points, and the part number is 8V2
061 501 041
Has anyone got the plastic rear mats and, if so, how 'rubbery' are they, and are the securing points in the same place as the original carpet mats?
Cheers, Allan