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I looked up outdoor tables in Travertine / Marble. Found a company in a different state to where I live that imports them from Overseas. They showed many designs from Italy but I picked an abstract in sand coloured Travertine with marble, abstract, angular pattern centre with modern design in black , white & choc. At 150cm round , 4cm thick , weighing 75kgs. Rock solid and looks beautiful with natural imperfections in the travertine ( a little rustic ). Can imagine it useful for many generations.

Kmart has a cheap one - search expandable rack. Not as nice as the one in your pick. You may also find one at an op shop or garage sale.

This isn't a personal recommendation as I have not yet purchased anything from this company, but I've been admiring the timber floating shelves on their website. https://shelvingshop.com.au/product-category/floating-shelves/wood-effect-finish/ Or you can buy the brackets and have the shelf custom made in whatever material and size you want. https://shelvingshop.com.au/product-category/brackets-2/floating-shelving-brackets/  I think hardware stores also sell brackets by themselves. I was thinking of going the custom route because that means I can ensure the brackets will be attached to the studs. I believe you can paint melamine after proper preparation of the surface, but I doubt if you can stain it.