I am running 3-phase 60 amp 208v circuits in an industrial building and these will still pose a problem for me.  My 60 amp circuits can only power 17.3 kW to stay below the 80% NEC safety margin and I can only put 5 of these per circuit, which really means 3 per circuit since it has to be balanced.  So I will probably run 3 S17+ and 3 S17 per circuit to balance it and stay below the 17.3 kW max.