the keyboard shortcuts- Ctr Alt with arrows

I am trying to carefully place as many as a dozen clips into the output at the same time.
all are scaled and cropped, it is just hard to 'nudge' them into precise placement.

time is not a problem, they are all aligned and cut perfectly.
the problem is, with a dozen clips on the screen at the same time,
moving them perfectly into position.
helps says you can nudge them into position,
but Ctr Alt with arrows does not seem to have any effect.
sample attached.

ideas?