Does anyone have an aftermarket dog barrier or gate fitted across the tailgate of their cars?

I am getting one made by a local engineer here but when we looked at the car we wondered about the best way to affix the barrier in place. Because it will prevent access to the underfloor storage area and the spare wheel I want it to be "quick release" with probably 2 wing nuts to loosen/tighten at top and two at bottom to fix or remove the guard.

The type of design we are looking at is similar to the attached pic.

If you have such a pet guard (like the "puppybars" product in Australia or the "barjo" guards in UK) then please post a pic so I can see how they look and are fixed in place.