Timo, as you may also recall, in TMP, COMMANDER Branch commanded Epsilon 9, which would support the commanders command starbase theory.
Would this listening outpost / comm relay be comparable to a starbase? It sounds more like that Relay Station 47 from "Aquiel", really - at the lower end of the spectrum of Starfleet installations.
And to be sure, we don't really know if Branch was in charge of that facility, or merely of communicating that facility's findings to the rest of Starfleet.
Still, yeah, two potential Commander-rank installation COs (Branch and Quinteros) and one certain (Sisko), plus one full Lieutenant (Rocha from "Aquiel"). And Commander Uhura seemed to be CO of the Old City Transporter Station, a lowly assignment for a high-ranker. Others?
Timo Saloniemi