How to stop floor mats sliding over?

[Pistachio]

Has anyone retrofitted floor mat holders in a 1*2 ? Mine keep sliding towards the centre of the car. Ideally I want the two buttons that other cars have that the mat clips on to

 

[Vaughan]

I've used these. Just cut two ~25mm circular holes in the mats. The pointy part pushes down and slides into/under the carpet.

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