I'd recommend 4-6 FSs. If u have a quite complex unitframe, I suggest to make sure that FCF frame is on a higher frame level and strata than ur health bar, frames and textures, e.g. unitframe's border and others.
As I said before, there r 2 modes, by default floating is set to standard mode, to switch to fountain mode u need to do this:
If u write anything else than "Fountain", default mode will be used.
Feedback spawns symmetrically at two points, to manage a distance between two columns u can use .Offset option:
Number can be either positive or negative, for fountain it better be positive . By default fountain's offset is 6 and standard's is 30
U can adjust how much time it takes for a text to float and disappear, default value is 1.5sec.
Some of the events can be ignored using .ignore%event% option. By default all the events are displayed.