Acoustic ISO Pads?

Are they helpful? Only $40 on Amazon. Currently I have bookshelves on top of cabinets made of wood. Mostly watch movies and some audio.

https://www.amazon.com/Auralex-Acoustics-MoPAD-XL-Acoustic-Isolation/dp/B00266HBSU/ref=sr_1_1?ie=UTF8&qid=1505876065&sr=8-1&keywords=Auralex+MoPAD-XL
AVR: Marantz SR 5011
L/ R: Polk Audio 703 LSiM (Bi Amp'd)
C: Polk Audio 255c - LS
R: Def Tech
Sub: PSW 505 (12 inch)
DVD: Oppo UDP 203
TV: 2016 Sony XBR 75X850D

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