Should PTZs Be Mounted Vertically?

A member wrote in asking a simple question:

"I have been told that you cannot mount a PTZ camera in a vertical orientation (wall).

Axis chat session tech said it would ruin the camera and void the warranty. However there was no online documentation available to that effect other than an obscure reference in the installation warranty “Do not install the product on unstable brackets, surfaces or walls.”

I have been told by another video surveillance design build firm that you do not mount PTZ cameras in a vertical position but could not provide details as to why.

Can you explain the issue to me and validate or debunk this detail?"

Essentially, the member is asking why/why not PTZs are mounted like this:

Can you help?

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