Surge protectors make it easy to keep them all charged.

Something like this would support 6 of those bulky adapters with easer.

Or you could even use a USB splitter and just trickle power them all rather than using the official power cable, if you dont need them all to have video output.

edit: if youre not using their docks, they do make small adjustable charging stands that would work in a pinch.

https://www.amazon.com/Charging-Nintendo-Portable-Adjustable-Charger/dp/B08LYQB736/