I believe the ring structure on one of the towers would rotate around its pivot, move into the structure, open, and extend forward to clamp and stabilise the rocket.
LM-10A manned rocket uses a new first stage, and the recovered first stage is used in the LM-10B commercial rocket.

Yes, safety is paramount for manned missions.I believe you meant that the 1st stage for every CZ-10A will be newly built, whereas after recovery, said 1st stage would be reused for CZ-10B, where it would be recovered + reused and/or discarded?
"CZ-10B is just the mover of CZ-10A's first stage," according to a CASC employee when interviewed by CCTV-13.
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