Half thought the same. Why would a criminal gang need a torture chamber in a container? Isn't any basement (and old chair) good for that? And why multiple ones,

Half thought the same. Why would a criminal gang need a torture chamber in a container? Isn't any basement (and old chair) good for that? And why multiple ones, how many people do they need to torture exactly at the same time? Is there a booking system in place like for meeting rooms? One possibility is that they're props, good to give a good scare to those who might think of scamming the criminals.