Review on MoKo Universal Laptop Stand Bundle - 4 Pack Anti-Slip Silicone Elevation Stand for Tablets, Laptops, and Keyboards - Gray by David Hill

Used on porous and non-porous surfaces, heavy laptops, light laptops, they just won't stop slipping. even tried to scratch the rubber around them to get traction. There are far better options, it's basically a doorstop that tried too hard. I chose to do this instead, https://smile.amazon.com/gp/product/B07ZK95JM9/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1