My only concern with the proposed mounting point is it's the lowest most foreward part of the car and hence it is what hits the road or kerb first. Look at most Pantera's in/under the front valance area and they are usually beaten up from kerb rash.
Secondly for a car with an air dam I think you'll find that point will be well behind the dam, certainly on my GT5 air dam that point is well under the flat portion of the dam.
What I intend to do for a GP4 car that will have an airdam is weld or bolt in a threaded tube just behind the grill and as you suggest just screw in the eye when required.
Good luck,
Julian
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.