Unless you're in the 'all potential evidence is faked' groupd I'd say the imagery provided by the flock of geostationary meteorological satellites is enough evidence to prove the earth is anything but flat. How else would it be possible to piece the overlapping imagery of these satellites together into a flat surface? Any flat-earthers around here who want to give it a try can get some imagery at [1] and start puzzling it all together.

[1] https://en.allmetsat.com/