My solution to this is a thin neoprene mat. You can get them in like 1m square size from Amazon for next to nothing and then cut them down to what you need. They add an epic amount of grip to pretty much anything. I use them to keep bookshelf speakers in place on floor stands, to keep the RPi4 w/ display in place on top of my Pxe (see Current Set-Up Pics - Official Picture Thread - #460 by cwichura), etc.