Also, floor presses, db variant included, aren't done primarily because it's a partial. First, the movement becomes a completely upper body movement. Next, while it does load up one end of the motion more than the other, one of the primary benefits of the floor press is breaking the tension in your arm muscles so you have to press the weight from a static position. And interestingly, especially with the dumbbell variant, it hits your pecs pretty hard. Last but not least, due to the ROM this variant is very shoulder friendly.
I would do these for higher reps, 3 sets of 12-20, with palms facing in.