The linked buck converter doesn't need soldering like the one in the video. You just screw the wire into place which is 100% easier. Def need the 3 pack. The first one the screws were kinda jank for me but the 2nd was perfect. Make sure to only wire in the red and black from the usb cable for power to the raspberry. Would also recommend setting the voltage to 5.2vs output on the buck converter. I had it set to 5.1 but klipper kept saying I had some undervoltage issues and that was resolved by changing it to 5.2.