But - hear me out - if all of your servers did have wifi - and it was usually disabled - but you could enable it, move the server, then disable it - that might be something?
I know having a redundant server is better - but there's something to it.
Also, this reminds me of a post I read a while ago about them moving a server from one building to another without unplugging it or something.
[Found it: https://news.ycombinator.com/item?id=24059243]