I use my own router with a MOCA bridge for my VMS to get a guide. I think G1100 has terrible wifi. But every once in a while a plug in the G1100 so my VMS updates then I go my to my original setup with my router.
So to answer your question I guess it doesn't really matter as long as all your devices connect to your X10 so they are all on the same subnet. The G1100 will provide STBs IPs so they get all the necessary updates and continue getting the guide/on demand.