You can insure the iPads, and a proper protective case is also a good idea.
For example, Griffin Survivor offers very robust cases.
Just make sure the iPad camera remains accessible so that QR codes can still be scanned.
For production tasks that always take place at a single station, it is also worth putting the iPad in a fixed mount.
The power supply should be installed permanently at the same time.
The drawback is that you can no longer use the camera as flexibly.