I don't think that would be sweet aye. It would be hard to come up with a better plan without having the engine and bay in front of me though.
What you are suggesting would create a pivot point on the xmember and uneven loading on the bolts and mounting points, rather than the normal load conditions. That is if I understand the way you are thinking of mounting it.
I think you would be far better to try and mount to the chassis rails if possible and if not perhaps try and modify the way the mounts bolt to the engine block itself, rather than the xmember.
I was thinking uneven load all stress will be on the bolts as well. The picture seems to show a bit more extreme mounting, 4-5 inchs max. I couldn't think of another way without new crossmember or mounted to engine as well.
I just print this page off and when comes cert time will show them this "na its alright the Internet told me"