French drain position - by wall or toe?

[Adam2]

What is best practice for locating the perforated drain? To me it would seem logical to have at the base of the wall (outside the waterproof membrane of course) as that would take any water away from the house wall. If it is outside the toe then this seems to me that it may be less effective + also will need more space outside the slab which we would like to limit if possible. Appreciate views on this - context is a semi-basement, concrete raft and waterproof concrete in ICF walls and waterproof membrane.

 

 

[Mr Punter]

Could you do both?  And a load of shingle?