[Namidairo]

I'd consider enabling the hardware watchdog as well.

While one could argue that you should figure out the source of your device freezing in the first place;

Nothing is better than having to ask someone to power cycle your Raspberry Pi while you're away.

[drpixie]

Yes. And I monitor my network link and automatically power-cycle the modem, if the worst happens. (Which is rare, but the network link has been the source of most of the few problems I've had.)

And use a wired network connection for anything important!