Those Monster Tech mounts look pretty solid but I have a feeling when I spin in my chair to get up (I don’t have rollers on my chair), I’ll eventually break the joystick holder off.
I liked the idea though so for anyone on a budget of like $10, there’s always that “primitive technology” 
alternative I posted a while back … really easy to make with a 2x4 and a piece of plywood …
The platform floats above my knees and if I do a full throw on my rudder pedals, my left or right knee is just grazing the bottom of the platform (good measurement point). I still love the thing and use a sturdy low side table for my throttle.