We perform heavy-ish 1 and 2 arm dumbbell floor presses in the following way as an off-season bench accessory:
With elbow resting on the ground, generate tension and explode the press.
Accentuate a slow active negative (~5s)
"Rest" the elbow but keep the core, pec, lat, and grip tight
Helps with horizontal press work while sparing the athlete from the bench "shape"