It's well-known that GFCI outlets can cause issues for powerline networking. However, is this true even if the powerline adapter is plugged in upstream of the GFCI outlet (i.e., on the same circuit, but between the panel and the GFCI outlet)? It seems to me that in this case the GFCI outlet should have no effect, but I can't find any explicit statements to this regard.
I'm planning to put a new circuit in that would be set up like this (panel => outlet for powerline adapter in basement => GFCI outlet for outdoor lights), but I want to make sure I won't regret it later. I can put in two separate circuits if need be, but since they would run in exactly the same location, that seems like a waste.