I use Ready Acoustics. Some come with a frame that you can just lean against the wall. I use 2 like this at the first reflection points of my speakers as well as wall mounted ones. I think they also have stand mounted ones.
Most effective Room Treatment for slap echo, etc
I am unfamiliar with room treatments products to eliminate slap echo, and to improve focus and imaging. I have no space in my living room to place two upright book cases stuffed with books to dampen down the room. Therefore, need advice and suggestions for a simple and reasonably priced room treatment solution. A member recommended Auralex. I rent my space,so wall or ceiling panels must have easily removable adhesive and not strip paint or stucco off the walls. Thank you, Jim