What is the best way to hang this absorber behind the piano?

Should I just put screws in the backposts, will this affect the sound or warranty on the piano?

Here's a picture of the blanket:





They have 5/8" ID grommets on 10 1/2" centers along the 48" side. It measures 48x48.

My piano is a 48" Upright, 59W, 23D, 48H.

Thanks....


Edited by tozoni (03/26/09 02:40 PM)