How to switch on/off stereoscopic 3D mode (not VR)

bump…nobody?

this is a real noob question but I can’t find anything in the docs.

I’m trying to test stereoscopic video playback and level rendering in order to get into VR.
Since right now I don’t have a VR headset my 3D TV should be good enough…or so I thought…

When I search for stereoscopic, the only things I get is how to switch monoscopic rendering on for far away objects and stereo layers.
Great…but how do I switch STEREOSCOPIC ON/OFF and how do I switch between sidebyside,overunder etc.???
Do I need to have two cameras present? Do I need to set a boolean somewhere to render two frames at once?

VR is all the craze now but there is nothing about stereoscopics?
VR is useless if your HMD won’t display stereoscopic images.
Or do I need to fake an HMD in order to turn stereoscopic on? but then it is for headsets not for regular, plain “old” stereoscopic monitors / TV’s, or is it ?

sorry for the tl;dr but I must be missing something very basic and I’m getting no help from the documentation…or not looking in the right place…

somebody please help, thanks!