Is there any point in a black hole where its acceleration due to gravity is maximum?

The interior of black hole is isolated from the observer by the demarcation called event horizon. When matters falls inside it's shredded to parts. Our knowledge of what happens in the interior is still speculative.

Inside there is point of mind boggling gravity.

The answer to your question, yes, theoretically the black hole is gravity monster and at the event horizon the acceleration due to gravity is huge. We don't know what's inside event horizon.

 

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