Hello @JDr4nd0m! Saul's passive ability activates no matter where he is placed. So you have the option to place him in your Chempound, Lab, or Camp. So long as he is in one of those three locations you will receive his bonus!
Hello @Teallanoelculo , thank you very much for posting that. It does appear that Saul's passive ability only works when he is placed in the Lab. I am tagging @JDr4nd0m so that they may be aware of this correction as well.
The color of the frame around the Specialists' portrait is a good indicator of where they need to be placed. If it is green, then they need to be in the Lab, Blue and they should be in your Chempound, Orange/Red and they're best on your Attack teams. There are some exceptions to this rule, but for the most part that's a great way to decide where to put your Specialists.