We use trapezoidal bridges on pitched roofs covered with trapezoidal sheets. This is an aluminium profile with EPDM washers, mounted directly to the roof sheathing using stainless steel self-tapping screws, also with EPDM washers. This type of bridge is also the basis for mounting photovoltaic modules.
We offer anodised mounting elements that will work well for mounting panels that have black frames. Anodising of aluminium involves the formation of an oxide layer on the surface of the aluminium to make it harder and more resistant to corrosion.