Maybe you should try getting those non-slip pads instead. Its the best way for you pad never getting slip off while playing. But I wouldn't know about the wireless pads though because I never tried them out.
I am a big fan of DDR and have 2 wireless pads. When dancing with one pad, it works pretty good. But when I want to do multiplayer and have both of the mats, they don't work together. Are wired pads better than wireless pads? Or do you have any suggestions on how to get the wireless pads to work together better?