Since Porsche didn't put them on ANY 914/4 nor 914-6 production models at the factory, except a couple of early show car 914-6's in the late 60's for promos, and a few "specials" - there are a lot of different placements around.
These include:
1-2" up from the front deck lid edge, limited by the mounting pins clearing the brace on the backside (this is my personal favorite) - and it visually coincides more with the placement on 911/912 hoods, for which Porsche does have a spec which is about 3" IIRC (another location some folks use) - but due to the more curved 911/912 front decklid leading edge only 1-2" looks proper for a 914's flatter/straighter front edge;
The factory spec for the 911/912, which works out to be about where the bottom point of the crest meets a line between the inner edge of the curved front of the headlight doors/eyebrows line;
Centered up-down on the headlight doors/buckets at each side;
Top edge of the crest aligned with the top edge of the headlight doors (my least favorite cuz it looks way too high);
and just about anywhere in between these above 4 (counting the 911/912 spec).
FYI - here's where the Porsche factory put it on their "specials" - the 914-8 (with the 908 flat 8 motor - the only 2 made), and even here Porsche used 2 different locations!!!!
Click to view attachment Click to view attachment .
Dealers did sell them & were more than happy to put them on for customers, as was the case with this Bahia Red 71 914/4 my buddy has owned since new. This I think is about the 911/912 spec'd 3" and it looks good, but I'd have nudged it about 1/2" to 1" further down closer to the front edge myself -
as would've Jerry the owner, but this was already placed by the dealer for another buyer who backed-out before he bought it (as with the Western Wheels, Rosewood Dash Face, Turned Aluminum Threshold protectors & radio on this 914 when new).
Click to view attachment.
So in this case of front hood badges - the choice is yours as to which location you personally prefer!
Maybe get a decal or color print-out of the badge that you can set in various placements on your hood to decides which location you like best.
Food for thought with these pix & others you may find in your search.