I have a few friends at CUSAT, so I think I can give you an idea about the placement opportunities available for their Fire and Safety department.
Fire and Safety Engineering can be quite challenging. If you are serious about your studies and put in the required effort you will definitely have enough opportunities at the time of placements. But if you are not that serious about academics and end up having backlogs the faculty will not help you during placements.
If you are sincere you can get packages similar to the ones offered at reputed IITs and NITs. Here is a brief highlight of the recent placement statistics for the branch.
Also, it is worth mentioning that CUSAT is NBA Tier - 1 accredited. Other than CUSAT, only IITs and NITs have NBA accreditation. So, CUSAT is definitely a worthy choice for a B.Tech in Fire and Safety Engineering.