"...in Thailand they probably have special cells for these kind of prisoners..."
No, they don't. All prisoners in their prison are confined in 20-30 person rooms after the nightly lockup. Thai prisons are not known for retaliatory violence towards other inmates.
"Don't think they are in the normal cells between the other criminals"
Obviously you have not spent any time in a Thai prison and cannot, therefore, know anything about them, in particular, the prison they are in.
At 6am prisoners are removed from their accommodation (which is all multiple person accommodation) and all prisoners mix freely in the yards or the work facilities. There are no special cells, except solitary punishment cells, and, in the late afternoons, they are all returned to those 20-30 person locked quarters for the night, regardless of their offences.