Please keep in mind not all installers understand solar, in this area these are the optimum angles of any panel, ideal is to adjust 4 times a year but we are speaking of summer attic fans here.
Figures shown in degrees from vertical in red are the hot months
Jan 46°
Feb 54°
Mar 62°
Apr 70°
May 78°
June 86°
Jul 78
Aug 70°
Sep 62°
Oct 54°
Nov 46°
Dec 38°
In June the panel is almost flat & Oct 54, or 70° is a good average if fixed.
So if your installer has a protractor it is simple to figure.
And it needs to be a south facing part of the roof.
.I didn't know they had fixed mounts for different angles, nice if done correctly?
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Nova Water filters
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