This paper addresses the sensor-placement problem (SPP) within the context of discretizing large, complex continuous 2D environments into graphs for efficient task-oriented route planning. The SPP aims to minimize the number of sensors required to achieve a user-defined coverage ratio while considering a general visibility model. We propose the hybrid filtering heuristic (HFH) framework, which enhances or combines outputs of existing sensor-placement methods, incorporating a filtering step. This step eliminates redundant sensors or those contributing marginally to the coverage, ensuring the coverage ratio remains within the desired interval. We implement two versions of HFH: the basic version and a variant, HFHB, incorporating a preprocessing technique known as bucketing to accelerate region clipping. We evaluate HFH and HFHB on a dataset of large, complex polygonal environments, comparing them to several baseline methods under both unlimited and limited-range omnidirectional visibility models. The results demonstrate that HFH and HFHB outperform baselines in terms of the number of sensors required to achieve the desired coverage ratio. Additionally, HFHB significantly reduces the runtime of more competitive baseline methods. We also adapt HFHB to a visibility model with localization uncertainty, demonstrating its effectiveness up to a certain level of uncertainty.

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