Best Spot for Placing Turret

As what you guys can see in my screenshots, when I played a game before..Having Engineer in the enemy side it caused me some trouble for placing his turret in a forbidden place(maybe it's a good place), why I called it forbidden and good place?
Because one reason, melee unit(heroes and creep) can't reach and attack it you know, it help you guys farm easily with Engineer.
But the range unit can attack it, so use it as the advantage when you guys are facing the melee unit.
I only got 2 place in the Top Lane of Legion, it's for the Engineer who play Hellbourne
Hope later if I got time, I'll try to find another good spot for Turret guys..

As what anony-guy told me another best spot for turret is the same spot for scout's electric eye when he placed his eye in order to watch the rune(Forest of Caldavar)
As far as I know(I tried it in practice game)
The melee can destroy the turret, and I still don't know why it's happening you know..

So another good spot, or maybe the conclusion, the best spot is in the top lane and bottom lane, in a small cliff like you can see in the pic :