I'm using the Holley 12-876 regulator/filter which is designed to be mounted next to the fuel cell. So if you have the pump in the fuel cell and then the 12-876 next to the fuel cell you would only need a short return line and the a high pressure line.

Up front I'm going to put the fuel pressure sensor at the end of the rail so the ECU knows what the pressure is at the end of the line. That way everything is controlled by the pressure at the end of the rail.

https://www.holley.com/products/fuel_sys...rs/parts/12-876