Thanks for all answers I am using Blagos miner and my plots do not overlap. I actually did a test. I had originally a NAS with 4 Tb attached to the 53 Tb machine (It was 57 Tb at that point) and "moved" I to one of the other machines. Size reported in pool went from 57 Tb to 53 Tb at that point. So pool does only "report" the largest. Question is if it is mining and becoming a part share calculation (I suspect not, since my payouts are to low, but that is only measured for a few days and I can obviously be different between days). I see all three machines submitting deadlines (according to miner).

/Thx