however, it works when you place the command block near the mobs, so it detects the radius of the command block. is there any way for me to use this feature but rather placing a block or a block with the name "Silence" (like using regular lapis lazuli block or using anvil to name the lapis lazuli block to "Silence") and without placing the actual command block
(ofc the command block that's detecting the lapis block would be in the spawn chunks)
I feel like armor stands wouldn't be ideal for survival, since you'd need a name tag in order to give them a name. I don't think I know enough about what your goal is to suggest an alternative, though.