FPP does support the DLA Lynx USB dongle for one DMX or PixelNet universe as well as the DLA Lynx EtherDongle for four universes of DMX or PixelNet.
If you go the EtherDongle route, then you can also use another home router instead of the switch and plug the WAN port of this second router into hour home network. This will allow your Pi to get to the internet for time updates but keep the multicast E1.31 traffic off of your home network. You can also open a hole up through that router to allow port 80 HTTP access through to the Pi so you can get to the admin web page.
If you want more FPP info you should go over to the Falcon site and they can answer any questions you have.