Walker class starships in Star Trek (most notably the USS Shenzhou in Discovery) appear to be unique in that the main bridge is on the underside of the saucer section.
Ironically, this screenshot had to be rotated by 180° as the first and best frames of the bridge in context to the hull showed the ship upside down. Here's a sufficiently faithful model which shows the location of the bridge in relation to the ship as a whole.
Other starship classes of that era (such as the Constitution and Reliant) have the bridge on the top of the saucer (apologies that this image is from the game Star Trek online, but it shows both ship classes and they're sufficiently faithful reproductions).
Even the earlier starfleet vessels had the bridge at the top of the saucer section, as shown on the Enterprise NX-01.
Has there been an in-universe explanation for the unorthodox position of the bridge on the Walker class?