Maximum safe amperage for LED Strips
This chip uses only 3.5V minimum so that the voltage drop at max current is less than 1.5V and temp rise ought to be acceptable for the conductors of 5m at 9A &lt; 1.35W.   You should expect that it is safe.  

Some SMPS floating supplies may introduce EMI on data by Common mode noise if excessive , which may requires attention to supply noise specs and possibly better suppression with better 1nF CM filter choke + caps to earth gnd.