I have purchased 4 Tapo C425 which are supposed to be the best in the range battery operated , but they are totally useless , beyond 3 meters they do not detect anything , an elephant may be dancing b

The only reasonable way is to supply the cameras with one let`s say a 10Amp (10cameras) 12VDC power source. Yoy can cable it in star or bus (or both) and convert it to 9VDC just before the camera. To