most (normal?) datacenters have A/B/C power feeds. Also east/west network runs. even if you don't have multi-line PSU's you can at least stagger the racks. part of being cut-rate is that they don't have these things :(
I spent some time in the (I think now defunct) SVTIX co-lo at 250 stockton. It was super low-end, super shoestring, in some ways lower-end than he.net - but they had multiple power systems and would sell you a/b power if you wanted to pay enough for it. 250 stockton was certainly built out to higher standards than the he.net datacenters, though the he.net datacenters were better maintained.
(My favorite "my fault" power outage story was that I would give my friends co-lo access, right? And then I'd call them when I needed remote hands that knew what they were doing. Well, you know how cheap nerds are. One of my buddies shows up with one of those ancient PSUs that have a 110-220 votage switch. My rack was 208v. He had the switch on the 110 setting. It fried my PDU, the same avocent that everyone in the rack was on. The outage wasn't long; I had a spare in the office that was only a few minutes away. It was super annoying, 'cause I had earlier given the man a perfectly good 1u chassis that came with a modern 100-240v autoswitch psu... which he put in. This was his second computer; I would have been happy to give him another chassis/PSU. I was so mad. So mad!
I actually didn't see him for a while... the next time I saw him... I was at a party, telling this very story. He walks in right in the middle. I point and kinda shout 'It was him!" which, yeah. uh, I should not have done that.)
1) ID, rack hall, rack number, company name. 2) no id, name, etc. 3) no id, company name, "I think it was left?"
all worked fine.