I am a huge Stillpoints fan for my speakers but are they effective under components?


I have been using footers for many years. The most significant use IME is decoupling speakers from the floor.
I will never forget putting Mapleshade large brass footers under my $30k, 200 pound Tannoy Westminster Royals. By preventing the bass, etc. from leaking into the floor, it turned my $20k speakers into $30k speakers!
More recently using Stillpoints. But yet to pull the trigger on SP footers under my electrical components. Is it worthwhile to do so? I do have them under my turntable and using the excellent record weight. Understand the physicality there. But more hundreds for my amp, preamp, etc.?
mglik
Consider the Critical Mass Center Stage 2 Footers the best are the 1 1/2 inch however the 1 inch are also a sonic blockbuster.
I got the screw-on versions under my SOTA Sapphire.  I got a trio of the little, flat versions under my Mytek BB.  As veteran reviewer Paul Seydor used to exclaim, "A whole world of difference!"
Uh, oh, don’t anyone tell millercarbon they’re isolation devices.
Based on everything you have said I would recommend using them under all of those components. You will probably wind up turning your $150k system into a $225k system. Assuming the same performance ratio improvement as the speakers, of course.