Doesn't matter as long as the power supply is adequately rated.
540 LEDS at 55 mA each on full white is just under 30 Amps so a 30 Amp supply is probably OK.
Now all three of your diagrams have faults. I will explain the grounding in a moment.
You can run the whole strip (presuming a Nano has sufficient RAM for 540 LEDs, I don't recall the figure just at present; that is another matter) as a "single" strip, similar to the first. A Nano is a far better choice than a UNO (and that in general).
It is true that 30 Amps could simply melt the foil on the LED strips, although it would probably just fail to light that many of the LEDs. The point is you must use cable rated for 30 Amps, probably about 4 mm². You run that cable alongside the strip so that it taps in to the strip each 1.5 meres or so - of course to both 5 V and ground.
That means at each tap it feeds power both forward and back along the strip, just as in diagram one you proposed feeding it at both ends.
So, you have a 5 V supply. The Nano requires 5 V to operate. Powering it via "Vin" is always a bad idea. Now to start, the data from the Nano to the beginning of the strip must run as a pair withe the ground, never separately. So what you do is to include with that pair, the 5 V coming back from the beginning of the strip to the "5V" or "Vcc" pin on the Nano. Three wires as a single bundle. This means there is no danger of the strip being powered and not the Nano (or vice versa).
By the same token, if there is any separation of strips in the chain, the data from one to the next must be accompanied by a ground, again as a pair. And that ground might carry some of the power to the LED strips depending on how the power is wired. This represents a major blunder with the second and third diagrams you showed.
As to the suggestion of problems with the 470 Ohm resistor, there will be no problems as long as the resistor is located at the "Data in" connection of the strip and you are using 5 V logic such as a Nano. If you try and operate it from 3.3 V logic such as an ESP8266 you may certainly encounter problems.