The 1-1376390-2: It is the female half — you crimp the matching socket terminals (sold separately) into the wires, then latch it onto the male header.
Latch Lock and Free-Hanging Mount — Field Fit
Free-hanging (in-line) mounting means the housing floats on the wire bundle, not bolted to a panel; the strain relief comes from the crimp terminal retention inside the housing, not from a cable clamp. If the harness sees repeated flex near the connector, add a tie-down point on the wire bundle a few inches back to keep the latch from taking the full bending load.