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I probably should have specified I’m using libcurl, but I did try the equivalent of what you suggested. I even tried setting a list of user agents and having it cycle through. None of them work. A lot of anti-scraping methods use much more complex schemes than just validating the user agent. In some cases, even a headless browser will be blocked.
In the US at least, most equipment (unless you get into high-and datacenter stuff) runs on 120V. We also use 240V power, but a 240V connection is actually two 120V phases 180-degrees out of sync. The main feed coming into your home is 240V, so your breaker panel splits the circuits evenly between the two phases. Running dual-phase power to a server rack is as simple as just running two 120V circuits from the panel.
My rack only receives a single 120V circuit, but it’s backed up by a dual-conversion UPS and a generator on a transfer switch. That was enough for me. For redundancy, though, dual phases, each with its own UPS, and dual-PSU servers are hard ro beat.