Just as an idea from the top of my head:
Get the
world space Y and Z position of edge into seperate float variables.
Use Float operator to add adjustment to the floats (so for example if you need The player to be to the lower left of the edge's centre: subtract (for example) 0.2 from the Z float and subtract (eg.) 0.5 from the Y float. You will need to play around with the positions until you find the right figure to add/subtract to the floats in order for the player to be in the right position).
Then set the
world space position on player to the Y and Z floats you just adjusted.
Im a noob and this is of the top of my head, but I hope it helps.
(edit to add:) Also there is a tutorial that appears to be dealing with what seems like an identical/simmilar feature, that may be useful to you:
(I have not watched this episode)
Good luck with it and let us know how it goes!