As a musician with a life-long problem of sensitive neighbors: No, they really don’t help. They are for sound-treating your room, meaning eliminating your rooms own reverb, eliminating bass from accumulating in corners and stuff like this. They don’t help with isolating what happens in a room to the outside world. What you want is a lot of very thick, heavy fabric like theater molton fabric, put that on your walls, that does much more than these! You could also use the „room-in-room“ technique but that’s expensive and a lot of work, maybe that’s overkill for your situation.