Can A Dahua PTZ Camera Be Mounted Upside Down?

No don't do that. That would retain water in the upper dome where the water seals are the weakest. It's designed to shed water away from the vulnerable areas in the upright position. Up side down will doom it to early demise. You could go with a 'positioning" style PTZ.
 
Could not load your pdf link, but I'm thinking the PTZ1A225U-IRA-N. It's just above $500 from Andy.
 

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+1^^^.
As you said, Andy has it, like on amazon.
 
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Could not load your pdf link, but I'm thinking the PTZ1A225U-IRA-N. It's just above $500 from Andy.

I have two of those and they are the ones I am looking to upgrade. They have a 2mp with the 1/2.8" sensor. The one in my link is 4MP with the 1/1.8" sensor.