Constant breakages

hi, my son is 26 and when he has a meltdown he either throws things ( mobile phones) or smashes things, his therapist has suggested getting stuff to keep in his flat to break or snap I.e bamboo sticks or a punch bag as as soon as he breaks something he feels a sort of relief. Does anyone else have this issue and what can anyone advise as to what maybe good things for him to break or snap that don’t cost a fortune. He also has an issue with noise ( he can hear the neighbour upstairs snoring ) we have suggested soundproofing but are not sure the landlord would allow it.