Miles : Me too, if there is any thing new out there please everyone share
This old post of mine that you might find 'usefully diverting'

link below :
https://permies.com/t/39508/rainwater/Rainwater-Catchment-Cedar-Shakes
Also If you do a Google search for Gutter diverters pictures* or downspout diverters pictures* you can glean a little more info
For the Good of the Craft ! Big AL
* Originally suggested by Jay C. White Cloud- thanks Jay !