speaker feet

I have a new Focal Sopra 3 floor standing Speakers Each speaker is 70kg weight. The Sopras have built in rubber feet with spikes optional to use.Under the Glass Base My sopras is standing on Ceramic hard floor. Now standing on the rubber feet but to make them stable I use 1-2 spikes feet to...

I'm fairly new to the Hi-Fi audio world and I'm curious if there's any good info on what to look for in speaker feet. I'm guessing they don't make a large difference as long as your stuff isn't reverberating from the vibrations, but I figured I'd ask just in case. And tangentially: what tools...