Your bottles weigh 0.25kg and have a diameter of (say) 50mm.
So on a 300mm x 560mm shelf you can put 6 x 11 = 67 bottles
Which in total then weigh 16kg.
Whose weight is distributed over the full surface.
I would have said - only small issue with that weight damging the wood once load in place.
Eample is this also with 15mm wood shelves:
https://www.topregal.co.uk/en/shelv...MI5vmtpKKd9QIVme3tCh1avg_qEAQYASABEgIWdvD_BwE
BUT 15mm is very thin for chipboard.
And might start to sag when it gets damp/old.
18mm would be much much better for they time he puts taller bottles on.
And I would have always gone for Plyboard for longtivity and no issues with getting damp from spillage.
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