Hi Beth! Long time no see, how are you?

I'd use a plastic anchor from E-Z products, they've held our QS8s in the past two rooms without nary the first indication of any type of a failure. I highlighted the 50# anchors because it looks like the Omnimount may only have 2 mounting screws? I used the 30# anchors for the standard T bracket that comes with the QS speakers.




Here's their line of products...
EZ Products

.

Rick
Our Room

smile