Sound Anchor Stands

I'm considering Sound Anchors stands for my new Pulsars. They have a top plate which bolts in to the holes in the bottom of the speaker. Blu-tak is not necessary and stability is enhanced. Since they are metal stands, can the bottom of the speaker be damaged by placing it on the metal top plate directly? I was told that wrapping clear packing tape around the top plate would work, but I don't know. Any thoughts or suggestions?