I'm thinking that safely using all available height will eek out a bit more signal. The terrain nearby is significant but not insurmountable.
As a rule of thumb, within one wavelength, there is quite a bit of interaction between an antenna and other metal, greater separation is almost always better. Flat metal roofing will act as a reflector, but sitting here, I have no way to predict the exact effect.
So the best I can do is suggest that the installer be ready to experiment with mounting location and elevation. They'll have more adjustment available with a 10' mast as opposed to a 5'.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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