How to secure to wall?

[Steverd]

What's the best way to secure this rack to the wall?
What would you use? Rope, wire, metal coat hanger wire?

See Photo the brackets on the wall are in studs, so I want to attack something
from the wall brackets to the metal shelving?

The wall brackets are about 4" in from the metal shelf legs , so it's not a straight shot.
But if I do both sides, would that prevent a forwards tips over?

Thoughts?

 

[KJAG]

Hard to tell from the photo/more info needed. The existing white hardware is attached to studs correct? And this shelf will be resting on top of the white "brackets," so wont be flush with the wall if secured? And im guessing if theres another white bracket off to the right it doesnt align with the keyhole brackets from the other end of the shelf youre trying to install? Depending on the weight youre trying to support, it seems shoddy. But maybe a bunch of anchors with nut spacers and longer screws to compensate for the void off the wall from the white brackets would work if theres not a ton of weight on the shelf. I also might put a couple self tapping screws into the white brackets for good measure. This is just based off what im assuming I see.