We drill at the 15th fret on a standard Martin guitar, where the neck joins the body at the 14th fret. The end of the dovetail usually is close to that position, one fret inboard of the neck/body join.
That's for a standard Martin dovetail, and it's necessary to drill at an angle to intersect the space at the end of the dovetail so steam can penetrate the full depth. I have no idea about the Framus joint, but I wouldn't be surprised if it is similar. Fact is that few Framus instruments have sufficient cash value to allow us to be comfortable spending much time working on them.
Drilling through the fingerboard is generally the least invasive way to get steam needle in there, although it's sometimes advisable to go from the bottom of the heel, removing heel cap and drilling diagonally to reach the dovetail joint.
Steaming, removing and resetting a guitar neck is not a trivial piece of business, so don't be surprised if you run into difficulties along the way.
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