Don't know about "need", but from Dropships & Jumpships p95
"Because the deck's drive motors and bearings are delicate, several locking rms must brace the deck in position before the JumpShip performs any maneuvering more complex that station-keeping."
While this can be interpreted to exclude K-F operations, I'd strongly suggest that a competent captain will do this just in case there's a need to move on arrival to clear incoming/outgoing traffic.
On a headcanon level, I just can't see why you wouldn't do this anyway, just to remove yet another potentially complicating factor. I mean, most subs don't ram mountains the moment they submerge, but it's common practice to close all the watertight doors internally beforehand.