The TS4 solution is modular, meaning each module can be outfitted with a TS4 cover to fit the application. On a single string, you can mix and match certain combinations of TS4s. Tigo refers to these combinations as Methods of Deployment. There are strict design criteria for the Monitoring group (TS4-A-O/-S/-M) and the Fire Safety Group (TS4-A-F/-2F) deployment methods. Please refer to this article, Methods of Deployment, for more information.
The 4 methods of deployment are covered in detail in the Tigo TS4 Design & Installation Certification Course. It is highly recommended that every Tigo installer and designer take this course.