Did the notice have a link in it?

@Yeeray Low okay, then you should be good to go!

It really just depends on how you mount the treatment. I know people who use french cleats to be able to quick mount and remove their acoustic panels. It still leaves one side of the cleat on the wall, but it also makes it really easy to quickly remove panels.

@Jane Scott They're pretty cool. This is just an example: https://www.monarchmetal.com/monarch-z-clips-and-hanging-systems/aluminum-z-clip-2-inch-stock-clip-size-1-4-inch-projection-3-8-inch-lift-off-mf375/?attribute_pa_options=bag-of-20-clips As long as you're not going for an air gap behind the acoustic panels, they're great. You can still use them if you're air gapping your panels from the wall, but you'd have to come up with a way to create the distance from the wall. Probably install a 2x2 inch square strip of wood across the back of the panel and then mount the cleat on that.