I own a pair of LaFolias and initially I had them on pucks. This made it fairly easy to move them until I was happy with the placement. They weight 165 lbs each so once I found the optimum spot, there they will stay.
They are now sitting on Sistrum platforms and the difference is HUGE. I was told by Robert at Star Sound (makers of Sistrum) that the platforms are designed to let the speakers operate at their full potential.
Some of the benefits I heard with the Sistrum platforms in place were: better dynamics, deeper/tighter bass, extended (not bright) highs, and an overall ease and naturalness to the sound. They also allow you to play a little louder with less strain. I highly recommend the Sistrum platforms.
Also, if your Silverlines are biwireable and you are using a single run of speaker cables, get rid of the cheap jumpers. I replaced my stock jumpers with Omega Mikro ribbons and the benefits are NOT SUBTLE.