Joint connector bolts for earthquake safety

Our shop’s earthquake
 
countermeasures are lacking

 
The helmet shelf and waffle shelf (in terms of shape)
We cut corners on interior finishing, so the floor is bare concrete
The surface isn’t level.
That’s why everything wobbles
If it shakes too much, helmets might fall off?
We’re storing about ten helmets here, so it’s a scary situation.
First, the helmet shelf
 

 
Decorative bolts and nuts commonly used in furniture.
I really hate having to drill holes in the shelf though.

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