And this is the receptical I use
ENERLITES Duplex Receptacle, 20 Amp Electrical Wall Outlet, Industrial Grade, 2-Pole, 3-Wire, 20A 250V, UL Listed, 62081-W, White https://smile.amazon.com/dp/B07YF2Y751/ref=cm_sw_r_apan_i_VH2P6QDA1KNKPN3AE605?_encoding=UTF8&psc=1
Use these outlets, one for each L7
ENERLITES Duplex Receptacle, 20 Amp Electrical Wall Outlet, Industrial Grade, 2-Pole, 3-Wire, 20A 250V, UL Listed, 62081-W, White https://smile.amazon.com/dp/B07YF2Y751/ref=cm_sw_r_apan_i_RYTT16D1K5QW6MER8FBT?_encoding=UTF8&psc=1
And use these cables
Heavy Duty Power Cord 220-250v UL 14 AWG 6-15P, Works for BITMAIN Miner APW3++ for Antminer T15, S11, DR5, A3, S9, D3, L3, T9, V9 and Also ETH and Many CryptoCoin Miners https://smile.amazon.com/dp/B07B3Z196P/ref=cm_sw_r_apan_i_XRHNMMKPW8J2VFSBHV8X?_encoding=UTF8&psc=1