For that, I'd highly recommend a power conditioner with outlet controls (and preferably sequencing).
Most are pretty expensive, but you can get something like a surgex squid or a gude expert power control for a few hundred here and there, which will give you great data on power usage as well. You can also grab an older model with serial and/or relay controls, and use a pi or whatever is handy to trigger it. Actually have a setup like that in a few racks for clients (mostly orange pis and a couple of Asus tinker boards).
Hope your trip goes well!