Without reading the manual. As I remember from several years ago, and it may not be that way now, is if you are within a certain distance from the controller, it does not rise to the RTH altitude and flies directly back to the home point.
How...
FWI: There are a lot of positives for the Airscrew Props, however, one negative I have heard reported several times in they area more brittle, the result if you nick a small twig or other object they will break apart increasing your chance of...
Not 3,000 feet, but I have taken multiple shots over a 1/4 mile stretch, then used stacking in lightroom to put them all together. It also provides automatic alignment in the process.
IF you had a Mavic 3 or later with the tele lenses, then it would be possible to get footage from a distance outside the aerial boundaries of the kites. Having a spotter with you would definitely be a must.