Potatoes in bee boxes

harvest from the 4 boxes on the left- 

position on tray reflects the position of the boxes

Photo below adds the 2 other boxes on the right

Potato tubers were almost all down at the point of planting
So when planting- plant on a raised mound and then hill up after that

Same with bags- put a good amount of soil in the bottom- 12" then Jill up from that point??