Pro Studio Acoustics - 12"x12"x2" Acoustic Wedge Foam Absorption Soundproofing Tiles - Charcoal - 12 Pack

How do u attach these tiles to the wall??

Will these dampen noise from a dust collector incased in a box with these? right now its about 90db, trying to get it down to 70db range.

Can these soundproof my room so when I play video games I’m not too loud for the room next door?

Would these help improve the quality of my stearo speakers by making things more clear?