Preparing Ubuntu to be turned off unexpectedly?

I have a few Ubuntu boxes that are locked down and used as Kiosks. Whilst we aim to turn them all off safely, the same can not be said for everyone.

The machines use SSDs and there isn't moving hard drives to worry about.

So far, out of about 1000 unexpected shutdowns that have been logged, other than a file scan on a few during startup, there has been no issues sighted and whilst I hope it stays that way, I can't count on it.

There is nothing that needs to persist between sessions and I was wondering if there is anything that can be done to make them more robust?