Hi Daniel, great choice with the Kidde FX-278! For optimal effectiveness, it’s crucial to install it in accordance with local fire safety codes and regulations. Generally, place the FX-278 in areas with high foot traffic and near potential fire hazards, such as kitchens or utility rooms. Ensure it’s mounted at the recommended height and away from obstructions. Also, consider installing additional units on each floor for comprehensive coverage. If you have specific concerns about placement or need further assistance, feel free to ask!