I quite surprised myself with a score of 120 (as well or better than 90.88%).
Feeling proud and wanting to share this using a screen-shot for you, I scored a fat zerooooooo in my computer skills.
Hey ho!!
I routinely use a ribbed or "squared" car mat under any class D (light) amp to help prevent it wandering around - or even falling off - the cab beneath. Works for me.