We propose a nonuniform deployment strategy of a group of homogeneous autonomous agents in harbor-like environments. Highvalue units berthed in the area need to be secured against external attacks. Defenders deployed in the area are expected to monitor,intercept, engage, and neutralize threats. In the framework of decentralized coordinated multi-agent systems, we model and simulatethe optimal deployment of a group of mobile autonomous agents that accounts for a risk map of the area and the optimal trajectoriesthat minimize the energy consumed to intercept a threat in a given area of interest. Theoretical results are numerically illustratedthrough simulations in a realistic harbor protection scenario.