The coordinates of M87 are: Right Ascension:12 : 30.8 (h:m) Declination: +12 : 24 (deg:m)
As a consequence, M87 is located in the North Celestial Hemisphere.
According to Shep Doeleman (EHT Director) on behalf of the EHT Collaboration (https://iopscience.iop.org/journal/2041-8205/page/Focus_on_EHT) to produce the first image of a black hole, his team used eight stations, one of them in the South Pole. I doubt that M87 is even visible from this last position. I would appreciate an explanation by a professional astronomer.
Go to the inter-doodle and download a virtual planetarium app and find out for yourself.
That's a good question! But the authors in article [1] shown in Fig.1 that SPT station located at the south pole was used for calibration only using different object (3C279). SPT did not observe M87.
[1] https://iopscience-event-horizon.s3.amazonaws.com/article/10.3847/2041-8213/ab0ec7/The_Event_Horizon_Telescope_Collaboration_2019_ApJL_875_L1.pdf
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