SNOT roads and streetlamps, fire hydrants, etc.

[Max Martin Richter]

I can clearly see the problem, that these parts should be vertical.
I don't know how much friction the hinge of this brick has:

Brick Design ID: 30014
And it's only available in Black and DarkGrey

Or maybe this one: 792c03 (it's available in White)

And see also my attachment for another way. (Note that the pin will be stressed, but it works fine. This is more or less an exploded view. But if the bricks had been assembled, you couldn't see the construction immediately)
All parts are available in White (OK, the 1/2 pin is very expensive ;-) )

/Max