Best Way To Secure Solar Panels and The Wires on The Roof

Anytime I install something where I can't or don't want to use a really stout bracket, I use 2 sided foam tape under the bracket, then screw it down and then use Dicor to cover and seal the bracket.

With regards to the cables, I like to use the small plastic cable hold downs and then completely cover each hold down and section of cable it's securing with a dollop of Dicor.