Sorry, @Wak4863 but your video DOES NOT answer OP´s question.
Since he wants
all info in your vid (only concerning placement in relation to horizontal distances)
as well as what you posted will not help.
The problem is that at the moment there is no way to have archers in an unreachable spot actually defending without them teleporting. This has been thoroughly tested by lots of forum members.
I made a request and collected the links to the relevant community threads here: