I use an extra tile or two with teflon gliders glued to them and spikes sit on top of that instead of directly to the floor. I use the spike cups also that hold the spike in place and keeps the speaker from sliding and also helps to absorb vibrations along woth the teflon rubber gliders underneath the extra tile . The teflon helps when you want to move the speaker to make adjustments - you do not have to take it off the extra tile. This helps to keep the existing floor from being scratched or dented by heavy speakers with spikes.
