FYI, my Livebox is not located near the mini ONT box orange (arrival of the fiber), I use both CPL directly between the Live box and the box of optical fiber. Contrary to the doubts expressed in some forums, this setup works great.
A however, that in this configuration, the Netgear utilities for the custom setting PLC (management of indicators, specific password etc ..) are not working. If necessary, the solution is to set the CPL previously connecting downstream of the Livebox.