They are designed to be in the sun and the weather and will hold up for years and years, exactly the same as the units designed to be roof mounted. They are made with the same material. If you figure a way to safely mount it (see if a ladder mount might be a possibility) it will be fine.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?