Wouldn't really recommend putting it below the vent on the bonnet! That's directly above the exhaust manifold which gets VERY hot, so the problems you will have are:
1) You will be blocking some of the air from blowing down onto the manifold
2) The induction kit will be sucking in all the hot air from the manifold (heat rises). If you chose to combat this by sheilding the IK with something, you'd be further blocking the air from reaching the manifold
3) Might get some splashes of water hitting the IK if it's raining (obviously not a good thing), although i'm not sure about that.
It'd be far better placed near the front of the engine, with a cold air feed to it and sheilded from the rest of the engine.
I could be wrong though