So I'm trying to put a pair of NHT Classic 3's on the NHT Last Stand speaker stands. I've never dealt with stands before, and the instructions that came with these were a little sparse. Do the speakers simply sit on top of the plate? Is there no way to fasten them to the stand? It seems very unsteady to me, given that the speakers are 20 lbs a piece themselves. Does anyone have any better recommendations for stands to hold these speakers? Thanks.