Everybody loves the effect of overlapping 3 sided sails.They are particularly suited to sites where the requirement is visual and not practical. You will need plenty of structure to support the extra fixing points though, if it is not already there.
A word of warning, 98% of people over estimate the extent of coverage a 3 sided sail gives. We recommend that you estimate how much you think you will get and halve it. Not a scientific method, we agree but we will be closer to the actual result than the 98%. Blades are not recommended if shade coverage is important to you. If you want wet weather protection,a Blade is not for you.