Powering 9216 leds @5V, @24V with converters
Since these are drawing up to 8.6A per strip, you do not want to daisy chain them as you show in the first diagram, since the first one of the chain will carry 60+A. The second arrangement is what you need, with only the data connection chained, and the power connections paralleled. There is no need for the 24-5V converters if you have a 5V supply capable of the current, other than if you have long runs of wiring. You haven't indicated what length of wire is involved, there are ampacity tables for most kinds or wire that will tell you the gage of wire you need, but for low voltage circuits, the acceptable voltage drop will likely dictate the gage more than consideration of heating.



This one is for solid wire, but will be little different or stranded. What you'll need to do is work out the lengths of wire for the physical positions of the LED strip terminations relative to your supplies, and use the ohms/foot value to work out the drop across each run (don't forget that the ground side also experiences the same drop as the supply). It'll be a matter of economics as to whether it's better having heavy wiring, or adding the converters to locally reduce the voltage near to the strip.