Engine bars/guard

[fazersharp]

if they swivel on impact they look  like they will go through the sump

I had to look at my own picture to see what you were talking about. I think for that to happen the upper mount would need to bend but also bend on the same axis but it is mounted on the opsite axis so wont bend like that --------- or something.
For me its not big spills I am protecting against but just stupid drops by myself really - rolled off the side stand last year as I did not realise how steep the hill was but luckily it tipped over on ME and a grass bank. So just stupid things like that.