Hard power-off as a requirement. How to safely enable?

I need to configure a Ubuntu 16.04 Linux system such that it withstands being hard powered-off regularly.

For regular operation there's basically no writing going on, so a read-only file system might be an option. However for things like remote access with TeamViewer I could imagine that this might lead to problems. I've tried read only for something else in the past and it lead to some unexpected issues.

This system isn't life-critical, so a 99.0% safety is enough and right now it's more important to get it done in a simple way.

What simple options are there?