Drag a wire off Event BeginPlay and create a reroute node
Move the reroute node to the left of the event
The wire appears to enter the reroute node from the right-hand side. If you try dragging a wire off the reroute node, you can see how the wires are supposed to appear.
I find I sometimes need reroute node to the left of its parent when stacking nodes vertically. However, my issue is more about the fact that array reroute nodes behave differently from all other types of reroute nodes in this situation.