This paper investigates the hydroelastic behavior of modular floating structures (MFS) made from ultra-high performance concrete (UHPC) reinforced with prestressed fiber-reinforced polymer (FRP) for floating photovoltaic (FPV) systems. The study analyzes an equivalent plate model to assess the impact of peak frequency and focused location on structural response. Results indicate a limited variation in structural response with peak frequency, except for notable peaks at 0.78 rad/s and 1.38 rad/s, corresponding to the structure’s first two natural frequencies, signifying resonance. Higher natural frequencies have a negligible effect on the overall response variation. Furthermore, the variation of the focused location does not significantly alter the internal force response throughout the focusing wave generation process. Energy distribution across the structure and transfer between modules mitigate disparities in force loading, making the MFS design adaptable and resilient to varying wave conditions.