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Just focus on whatever you want to be in focus and choose the required F-stop.
If your doing a 3 shot stitch to get the look of shooting it with a larger format lens, Benzler method or whatever its called, then you focus on that subject
If you want a landscape shot with everything in focus, you would use the hyperfocal, just like doing a single frame composition.
Using really long glass for multi row pano's can present some issues with DoF, but with just a 30mm lens, DoF really isn't an issue, nor is field curvature as you rotate the camera