I have a GL702VS (i7-7700HQ, GTX1070) and when playing Dying Light on a roof looking over the view i get 99 fps. When i activate streaming with your settings and connect to my own stream from my GL702VS the fps drops to 86-89 so i get around 14% fps drop.
Not sure if connecting to my own stream is the same impact as others connecting but i do detect a drop in fps.
Comparing performance between GL702ZC and GL702VS the GL702ZC have a much faster cpu up to 100% faster in multi-core while the GL702VS has a much faster gpu around 80% faster.
-EDIT-
Did some googling and your Ryzen should stream better than my 7700HQ and fps cut in half when someone enters seems to be what you can expect. Why i only got 14% fps drop is probably because i connected to my own stream instead of other connecting over the net.