You've recommended your Indoor Sports Tiles for high-heels. Are these tiles scratch and scuff resistant? Does the guarantee include damage due to high heel scuffing? Your Grid-Modular tiles scuff easily from high heels as I've witnessed in a ballroom dance studio. Also, will the tiles differentially deflect at the seam connections when mounted above the recommended 3mm underlayment? The concern here regards safety and the potential of shoes catching on the seams.