Lots of choices when it comes to speaker stands. For my Kef LS50s, I chose 24" Skylan and filled the vertical columns with sand and used Blu-Tack between speaker and stand. Have hardwood floors over slab and use spikes w/spike cups.
As a general rule, stand height should place tweeters at ear level with mass loading of stands for stability and vibration/resonance control. IMHO, speaker cones should move but NOT their enclosures
As a general rule, stand height should place tweeters at ear level with mass loading of stands for stability and vibration/resonance control. IMHO, speaker cones should move but NOT their enclosures