This is my new favorite finisher for legs (video here: https://www.instagram.com/p/Bx2gkdQDtHl/). You won’t need added weight. You won’t need many sets or reps. You won’t need a platform to begin with, because the tissue won’t be ready for this extreme angle in most people, even highly trained athletes. Be careful. Gently work your way into increasingly greater depths over time.
What I’ve now seen is that foot health helps or hinders execution of sissies (and a whole lot more) in most people. The foot should be as or more dynamic than the hand. If you have always used it as a petrified hoof, you won’t have the foot mobility or toe strength to handle a deficit or maybe even full ROM at floor height. BUT, over time, you want to gain this capacity regardless, since, as evidenced by this movement, it does dictate how well you move through the rest of the chain, ankle, knee, hip, back, and even neck.
People will complain of neck, shoulder, back, hip, knee problems without ever addressing the ankle and foot. Go ahead and get new window panes; still got a crap foundation.