The Etherregen should be directly in front of your streamer; the connection via Meicord Opal as short as possible. Rather than use a repeater consider using an Apple Airport as a repeater. Repeaters going via the power lines collect all sort of noise on the way. Alternatively you might use a mesh wifi setup.
From where I sit there is no need for a network bridge once you get the Etherregen since that is a 4 port switch in its own right. I’d also suggest you experiment with shifting the LPS to the Etherregen and consider getting a second one.