Using these products on the shelving your gear is on should be fine. The main concern would be blocking the air circulation that flows around the components.
Putting products like these inside your gear can cause overheating, shorten its parts life. Worse yet, a safety hazard. All of our audio gear dissipates heat. A lot (possibly all of the heat) of this heat is dissipated through the metal cabinet itself. When you put some of these products inside of your components, can also lead to thermal runaway type of situation. You need to know what your doing.
If you don't have any temperature measuring devices to check the running temp of the unit running continuously before, and after installing these products, it can be even more risky.
Putting products like these inside your gear can cause overheating, shorten its parts life. Worse yet, a safety hazard. All of our audio gear dissipates heat. A lot (possibly all of the heat) of this heat is dissipated through the metal cabinet itself. When you put some of these products inside of your components, can also lead to thermal runaway type of situation. You need to know what your doing.
If you don't have any temperature measuring devices to check the running temp of the unit running continuously before, and after installing these products, it can be even more risky.