I use cones also and after the same incident I drilled & tap the cones and bolted them down to the shelfs so the can't tip over anymore.
Supplied equipment feet or cones ,etc?
I own all ARC equip.ls16 pre ,100.2 amp and the new cd3 .I just recently had an accident where my daughter fell on to my audio rack knocking over my amp which was suported on mapleshade 3 point cones.Needless to say it got scratched and I freaked!I am now switching al of the above equip. onto the original iso-rubber feet.