I have an indoor/outdoor rug on a rough ceramic tile patio. The spikes hold very well. Sometimes I place the tripod where only two legs touch the the large rug. I just place a bathroom rug under the third leg. Works perfectly. The tripod has never slipped , and I have bumped into the leg many times. I had originally thought I would drill holes in the floor for stability, but there is no reason for this as per my experience. At first, I tethered the legs as a precaution, and the tether is still there, ( the sling included) but there is no need. It's just something to get tangled in. These work quite well with a high-power firearm. Very stable and usable. I've used them on a wooden deck with holes drilled to accommodate the spikes. Use max eye relief , if you don't use a muzzle brake, from a chair. Trust me on this one. Over-all, these work very well for me. Very effective reclined in a chair looking for needles in trees at perhaps 75- 80 degrees. A bipod such as a "Dead Deer" is also very effective and frankly , easier and better with very high angles of inclination. I purchased one from sportsmans guide for I believe $135. Very good deal.