Place one piece all the way in the corner and pair another piece to form a 90-degree angle. Tuck the extra exposed mesh from the end of the gutter guard underneath the adjacent gutter guard. In some applications, extra mesh or scrap aluminum might be needed to fill any gaps. Closing off these gaps will keep debris, insects, and pests out of the gutters.
Consider adding a Rainwater Diverter if overflow is occurring at roof valleys (or other high flow areas) to help to disperse rainwater over a wider area. Trim the Diverter to closely match the shape of the base of the roof valley. Once trimmed, bend the diverter to shape and slide it under the shingle just above the gutter guard.
Gutterglove Pro can also be special ordered in 14 mesh if additional water flow is needed.