What is the evidence that the Multazam is between the Black Stone and the door of the Kaaba, and that supplication there is answered?

Numerous hadiths have been reported about the Multazam, including a weak hadith from Abdullah ibn Amr, and a weak hadith from Abd al-Rahman ibn Safwan, and a weak and mawquf narration from Ibn Abbas. Despite the individual weakness of these hadiths, they are strengthened collectively. Scholars are lenient regarding weak hadiths concerning the virtues of deeds.