Final answer:
The effectiveness of indoor traps largely depends on their location, which should be optimized for maximum encounter and capture rate of pests besides the number of traps set out.
Step-by-step explanation:
The effectiveness of traps indoors is most affected by the number of traps and location. The location of the trap can make a significant difference in catching pests because the traps need to be placed where the pests are most likely to encounter them. This might be along walls, near sources of food, or in dark, hidden areas where pests are known to travel or nest. The effectiveness of the trap can be compromised if placed in an area where the targeted pests do not frequent. While the number of traps does play an important role, the optimization of location is crucial to maximize the capture rate.