Need help of heating rack with different sized tubs.

So I built one of those 18 tub 28qt utility racks the other day and I'm going to put 3 16 qt tubs on top, 10 28 qts in the middle, and 3 41qts on bottom. I'm putting 3' flexwatt across side to side to heat the 16qts and 28qts but only 2' at the end of the 41qts back to front if you get what I'm saying. Do I need 2 thermostats to heat the 41 qts and the others or will it keep temps in all tubs the same?

Thanks

I would think yes because you're heating different sizes of flexwatt.

Ideally, I think if you're heating the same length and width of flexwatt it should heat the same on each row. But obviously when you change the dimensions, the heating will change.