Area rugs on carpets keep moving

When I lay area rugs over carpets with kids around the area rugs move around and turn up at the corners and gets ruined.

How can I keep these area rugs from moving ?

We used the rubber/latex available at Home Depot. Using this, the area rugs hold on tile but not on carpet.

Can anyone suggest anything ?

Thanks,

Kim

Could try one of those things for "sewing" on buttons that use plastic fasteners - like what price tags are fastened onto clothing with. It might not be real secure, but should give in case someone trips on the edge of the rug. Or a curved upholstery needle to stitch them down with?