Large spider walking upside down

Many fantasy stories involve large spiders like in Harry Potter. These creatures behave almost exactly like normal spiders despite their size. My question is: can large spiders still walk upside down on flat surfaces? And if so, how massive could they get while still keeping this ability?

The giant spider would be about the size of a large dog breed like Newfoundland or Saint-Bernard : between 60-70 kg

I'm using the Hard-science tag (it's my first try). I'm looking for answers citing scientific papers or equations.

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Large spider walking upside down

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