hi
have used powerline adapter to network dvr back from out buildings and down from the loft on many jobs use tp link 300 or 500 mps models find they work 99.9 % of the time without a problem, if they lock up you need to reset the mains .the cheap ones off ebay rated at 100mps fail after a few months, also the one that you can still put a 13 amp plug in also cause problems i have found they all require a good earth and work well over 100m if on the same fuse board also used in offices with covert camera installs