I'm new to this whole DIY ambilight thing so I thought that ordering a package that was already configured would suit me. Upon receiving it and seeing there's better sketches out there (like FastLED/Hyperion's adalight sketch/etc) I tried to update my "Dream Color box" which after some exploring, was just a fake Arduino UNO. However that one uses the CH340G chipset and it's just useless now.
I purchased a real Uno, now I have to do the wiring to the LED strips (WS2812B, 102 LEDs, 60/m) and the 5V power supply from the kit. I found this wiring scheme and I wonder if it will work with Hyperion.NG / Adalight on Windows 10, using the Hyperion Screen Grabber (since it doesn't cause lag on my 144hz monitor).
What I purchased was something like this
DIY Ambilight from Aliexpress Kit Package
The fake arduino just had the 8 pin connected to the DC jack, like this, but it worked somehow:
1. Can I re-use the Arduino's DC jack to output the data instead of wiring/jumper cables, that would make some of the process a bit easier since the strip has the plugs already in it, but I'm leaning towards a full adaptation and leave those DC Jacks in the trash.
2. Should I use a different resistor since there's not many LEDs?
3. I live in the EU so the plugs are around 220V, I think the PSU is 6A, will this be enough or should I get another power source with more amperes?
Any help would be appreciated, and I apologize in advance if I sound too confused or out of the loop, I've been trying to learn as much as I can! 
Thank you very much!
Edit:
More wiring configurations I have found, not sure which one is the "best":
