I have processed a bunch of datasets from the Mini 2 and Dronelink a there are a couple of things I learned that are not in documentation:
First, Mini 2 has a rolling shutter and someone on this forum tested the camera and kindaly shared his result: 26 for Mini 2. So when processing you can enable rolling shutter correction and input that value.
Dronelink is great and I got good results flying at various altitudes. I found the ODM documentation about camera self-calibration a very good read that helped me understand the process a lot better. Between that and posts on forum, I interpreted that is was recommended flying grid patterns with a slightly angled gimble, say 85 or 80 degrees, and it seemed to work well. My overlaps were between 80 or 90 side and front because I wanted really clean maps.
I found Pix4d websites also have some good guides.
Ground control points help improve georeferencing a lot but that usually requires require some more expensive GNSS equipment.
The Mini 2 is a great little drone and I still find a lot of uses for it even though we have upgraded to a Mavic 3E. Feel free to reach out if you have any questions about it after getting familiar with the various documentation.