This only tangentially related to GP but Steve Endow looks Travel Power Outlets as part of his Consultant Tools series.
I have my own favorite. It’s the old fashioned, 3 outlet, bright orange plastic adapter. No it doesn’t have fancy USB plugs, but short of pulling out a prong, it’s nearly indestructible. Plus, they are about $3 at any grocery store or hardware store in the U.S. so I don’t feel bad when I accidently leave one in a hotel or airport charging station.
The right angles make easy to plug in any kind of adapter, no matter how big. The design does hold things away from the wall which is only an issue when the plug is behind the bed. It’s also surprisingly compact in my bag.