I have a graphics card GIGABYTE GV-R797TO-3GD OC GHz Edition HDMI, so even a large flagship. Out of concern for the graphics card and the slot I wanted to stabilize them.
The problem is, the graphics card has 3 air and a slightly curved surface. For the rest there was no hold, it always slipped off to the side.
In the end of the slot holds my graphics card also so loosely.
As a cheaper variant you can just trim your Plastikroh and up sticking a piece of carpet up.
As I said in my case it was even without the support perfectly.
Lg
mo