I like chair and mounted. For small - medium size binos an idea has been lingering in the back of my mind....
a "stake mount" with articulating arm attached. The advantage is that the vertical column / pole can be closer to the chair than a tripod, which is less leverage on the arm.
This is the best mounted setup i have used - compared to P-gram, tripod, monopod, fluid head w/ boom arm.
Only con is that you need soft ground. The cross piece is so that i can stomp the stake in the ground.
I was on hard packed dirt when this was taken....