if you are pushing that much throughput
Nobody is going to blink at using 7kW of power, even if it means having to draw power from 2 racks.
Likely any such facility hosting such a piece of equipment with bandwidth needs in excess of 100Gbps will easily have enough power budget in a rack to run it, one thing to be careful of though would be to ensure the cabinet has 3 PDUs from 3 different sources of power/generators, and put two PSUs on each PDU. Technically with the specs you could draw 7kW on 3 PSUs on a single feed, but personally wouldn't feel comfortable pushing things to that kind of limit. Though likely real power draw will be far less than the peak, so probably doesn't matter.
I had one service provider several years ago go down at one site(not a site I was hosted at but still impacted the routing in the region), and it was due to a power outage, but more specifically whomever set up the equipment for whatever reason, had all of their core router PSUs hooked to the same UPS/generator(when the facility they were at had multiple). So clearly setup incorrectly and eventually bit them in the ass when that one feed went down, took out their core router(s). The whole facility didn't go dark just one set of feed(s).
They owned up to it quick after I drilled them, and committed to fixing it fast. Stupid mistake, but the provider has a 100% uptime SLA with their customers so not a mistake that should of ever happened.