We have on a length of 16 meters only 2 downpipes (steep roof) (one in the beginning and 1 on the end), and they manage even on a heavy downpour, but as I said on my post above, SLOPE of the Gutters matter.
Don't use the "steel" ones that the guys that drive around trying to sell them, we used it in our House in Pattaya because it was cheap but it needed replacing after approx 2+ years, rust everywhere.
We have now used this https://vg-cnp.com/gutter/ in our old house (7 years old) and our current house (2+ years) and NO issues.
One thing have a competent crew install it because you want the gutters slope to the drains.
Try this
https://aseannow.com/notifications/options/
And click "Stop all email notifications" or select the ones you still want to receive (from the drop downs above that message)