Limiter on Floating?

[neewbie]

whether it can be applied to the floating limiter. eg rules on Lan in / out 384/512 kbps per ip. (limiter per IP)
Then I apply it also in a limiter on floating for a few specific ports such as http in / out 200/384 kbps. (limiter to port)
on floating
action pass
enable quick
lan interface
direction out
any dest
dest proto http
In / out: 200/384 (limiter for port)

I have tried the application of the floating limiter but have yet to see the real difference between the floating limiter and limiter on the rules in Lan.

is there any wrong on the application of the floating limiter for some ports.?

Thank you