Looks right to me, with one exception in item 2. There's no absolute altitude cap, just 400' above the top of the structure. So, you could climb to 1400' AGL over a 1000' AGL structure.
On added requirement - Part 107 pilots flying above 400'...
I have never seen that option. To do vertical shots, the Mavic 4 Pro does "true" vertical shots, meaning the gimbal rotates to do so. There is no need for a vertical crop.