Solar panel weather-resistance w/ permanent flat mounting

http://www.amazon.com/dp/B00CWLEUBA/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=38DCPZPLWKJAB&coliid=I8GTXRL6KL5ZA

Something like this?

I thought that the curve of my TT roof would provide adequate tilt to allow water to run off. But now my dad's issue has me worried that my panels are vulnerable to the same type of damage, especially if snow accumulation prevents any liquid water from draining.

Pianotuna, I know you're located up North. Do you have flat mount and/or concern about this type of issue?