Spikes don't help on carpet

This doesn't stay in place on low pile carpeting. I researched extensively a chair pad that would not move around on my carpet. This one has spikes and is advertised as the correct item for medium pile carpet. Well I found it slips out of position within a matter of minutes and buckles up against the desk and credenza. I have now purchased two different chair pads both advertising they are the ones for medium pile carpet and they both move almost immediately once a chair with roller wheels is moved across them.

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