I have stillpoint ultra ss under my down firing sub, makes a big difference to the sub performance.
I also have black ravioli mk 2 big pads under my isotek sigmas mk2 power conditioner, again big difference to imaging and much more relaxed presentation. Beware though that I had to wait a week for the sound to settle and on day one and 2 the sound was muddy.
For my ss amp, ( Lyngdorf TDAI3400), and my Etheregen network switch I have black ravioli mk1 pads a stack of 2 plus and oak cone for eack footer (4 footers on the amp 3 on the switch). Tighter soundstage but less of an improvement than speakers and power conditioner.
Apple TV just has 3 black ravioli mk1 pads and I weight the top of the unit. Improvements as above.
All my isolation above equipment bought 2nd hand at 30% to 60% retail.
Buying 2nd hand let’s you try and you can move on for minimal loss.
I would like to try the stillpoint minis under my amp at some time but it’s not a priority.
If you want ultimate vibration control bang for your buck, I would reccomend getting some fo.q ta32 and ta102 from eBay Japan and research using it throughout your system including power outlet plates, cabling, equipment chassis (especially near iec inlet), speakers cabinetry and drivers including stands), pcb and electrolytic capacitors(careful it is conductive).
I had a pack of each so far I want to get another pack of each as it is incredibly versatile if you are careful and not concerned with warranty of your equipment you can really deliver much more SQ than what you could achieve with 1 set of stillpoint minis. If you are concerned with warranty then you can still achieve much on external chassis, cabinetry, plugs, cabling and sockets. It is adhesive but its very easy to use and remove.
Fo.q and oak cones may make a very cost effective footer option too.
Good luck with your vibration control journey.