Placement of keel blocks for haulout

[dwkfym]

Hi,
I did a search and I couldn't find an answer.  I've heard about boat yards putting keel blocks in the incorrect spot on the keel, aft near where the bilge is where its the weakest.  This causing the fiberglass on the hull in the affected area to weaken, later leading to oil-canning. 

I was wondering what is the proper placement of the keel blocks then?  Should the boat be tilted forward with a flat block near the front of the keel?  Or a different arrangement?

Thanks in advance. 

[Skookster]

Surprised no one's replied! Anywhere beneath the front 2/3 beneath the keel is fine. Almost 3/4--you can tap and see where it goes from hollow to solid.

[dwkfym]

thank you!