See Video:
https://youtu.be/FGbj24elYNA
the inserter that needs power is already out of range when hovering over the position shown in the picture below and therefore should be already placed at that time, so it doesn't fall out of range.

This would also make the dragging feel more responsive than it is now. This may seem like an edge case, but I have problems with PP placement in Speedruns quite often and this is one of the main issues actually.