I found this image on reddit which has almost the exact same circumstances as me, but I can't find much info on this online (or what it's called if this is even a thing)

Long story short, a property I've bought has some poor drainage, in large part due to the guttering being poorly maintained, shitty pipes, etc.

It has a long run on a roof of around 20m (50~ft) with two down pipes at either end, but because the guttering is all fucked it up only goes down one of them. I intend to just take out the existing guttering and putting my own in, but I do want to utilize both down pipes on either end to move as much water away from the property as possible. Is having the high point in the middle like image attached something that can/should be done?