We have some published, per-reviewed data suggesting very positive effects on bone growth and regeneration:
https://www.josam.org/josam/article/view/27
I also have been given a lot of feedback (anecdotal) from clinicians and users related to orthopedic injuries and implant engraftment. My opinion is that PEMF can be very helpful for this. Unfortunately the devices with FDA-approval are “frozen in time”, because with approval comes essentially a halt in the innovation. So, effectively, FDA-approved PEMF devices for orthopedic use are based on technology that is about 40 - 50 years old. Basically think “disco-ball tech”.
A lot has improved since then. Modern PEMF technology is much better in my opinion.
With that said, taking everything into account that I believe I know and can reasonably support with reliable and repeated information from many sources, I would suggest that since you have an M1, consider this approach:
Start with the Omni-8 pulse pattern, but after a week or two you might also try Alpha Wave, or Schumann 4. There is no magic pattern, but changing the pattern from time to time seems to help (by mitigating habituation).
An intensity setting of 11 to 13 would be OK, especially for deeper tissues.
Coils: Try on alternate days stacked (bumpy-to-bumpy side) or coils on opposite sides (bumpy sides away from the skin).
I suggest using the device as long as possible, every day, at least 6 to 8 hours per day, but might be better to use it at night too if possible.
It would be helpful if you could write back in a few weeks (or sooner!) to let us know how it works for you, and any insights or suggestions you have.