Site inventory from the p2p maps: GPU→leaf, then leaf→spine, then northbound. Remainder rows 7 and 17 keep E1–E5.
Rows 1–10 · outer GPU → E-W → N/S at center
12 BE spine racks × 3 clusters · 4 FE cores · 2 edge racks (OOB SN5610 spine + OOB SN4700)
Rows 11–20 · N/S at center → E-W → GPU