Star Station Echo is not a canon starbase, and is based on the Lotus-class starbase Star Station India. In the Continuing Mission campaign setting, Sargon and Beyond, Star Station Echo is the station closest to the Sargon Region, and can serve as a home port for the players. However, you are free to use the station anywhere you need in your campaign.
This version of Star Station Echo is modified for 2372.
Also, we have a Star Station Echo Grand Hub floorplan that you can use.