Shrink wrap, corner pieces on all 4 sides then taped around. Cardboard over shrink on all 6 sides.
If smallish or monitors, (two in one box) face the drivers towards one another.
Then Bub-bub-bub-bububble wrap it till it bounces.
Then strap 'em to a sturdy 4 way oak pallett fore and aft, and as well side to side, standing upright! That way they'll arrive together, and strapped to the pallett, nothing can be set onto them.
Aside from a Shrike missle or termites, you'll be fine!