Two mounting questions - One corrugated metal roof and one steelmaster building

[timthrifty]

We currently have a DIY solar system on our house (Flat concrete roof) with a homemade welded rack which is bolted to the roof. We are now doing two more solar installations - One for a second house on the property and one for a newly constructed steelmaster arch building. Trying not to spend a fortune on either installation, but at the same time, we live in a hurricane prone area, so they need to be secure. On the steelmaster building, we don't want to drill any holes through the arches, so I'm thinking that whatever rails/feet we end up using, I can just bolt it to the arches using the existing bolts that are holding the building together.

What would be the best product / method for attaching to these two types of buildings?