Already have one kit. Need to add another if possible? But it needs to tie into where one of the power lines is already at where the cablemode/router is at. I am not sure how this works, its all black

Have a camera far out in my yard using POE and Cat6 to reach it. Eventually it makes its way back to a garden box where my pond pump is at, and I have this homeplug plugged into one of the recepticals