Rack locking solution (easy DIY)

I bought a reptile basics brand rack, the 6 drawer model, and upon arrival we found that though the fit of the drawers was snug, it was loose enough that our 3 year old son might easily open the drawers if interested. To remedy this I looked into luggage locks, and with drilling one single hole in the rack (on top) and a hole through each drawer to line up with the stopper holes already in the rack I created this locking rack system.

Here is a link to the locks I used: https://smile.amazon.com/gp/aw/d/B01...f=yo_pop_mb_pd

And here is an album with more photos of the rack after modification:
https://imgur.com/a/qVIVR

I did also drill holes for venting in the fronts of the drawers after these photos.https://imgur.com/a/qVIVR

Hey now, that is a great idea!

Looks good. However, to access a drawer, do you need to also remove the lock from the drawer below it? From the picture, it looks like the lower drawer lock would interfere with the drawer above it.