I recently had a go a this mid foot cycling thing. Putting cleats mid foot. Used the adapter plate you can get.
My reason personally is because I've not long had ankle fusion so thought it would be less lever arm forces through the ankle which it does quite well.
However, when going slow and a bit weavy like up steep hills, out of junctions etc, my foot quite often catches front wheel which feels bloody lethal. 😬.
Anyway....think I'll shift them back.
Anyone else mid foot cycling?