Yeah, that inline transformer is much better if you’re trying to mount the QC on a board and you don’t have an existing power supply that can handle it. But if you want other pedals, I guess you have to add another PS to the board as well. My perspective is definitely with the QC mounted on a board. My preference is to have one PS with enough isolated outputs to support all my other pedals in addition to the QC. I can quickly list here 3 ways to do that from what I think is least desirable to most with the main factors being MAP cost & available isolated outputs. Keep in mind that my independent testing of the QC power draw topped out at 1.76A, nowhere near the 3A rating of the stock power supply. 2A of current will be enough to power the QC (supported by CIOKS & VooDoo Lab).
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Walrus Canvas Power HP $230 + $40 for power supply = $270, 3A power output for QC, 3 isolated 9v 500mA outputs for other pedals.
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CIOKS DC7 $289 + CRUX $89 = $378, CRUX provides 2A of power at 12v, 7 very flexible isolated outputs (9/12/15/18v) for other pedals, DC7 alone can do the trick without the CRUX but requires using 4 of the 7 outputs at 12v 500mA each and a complicated cable merging config.
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VooDoo Lab Pedal Power 3 $229, provides 2A of power via X-link output (2 outputs share 2A so just use 1 for the QC and leave the other unused), 8 isolated outputs for other pedals (6@9v 500mA, 2 switchable from 12v 500mA to 9v 200mA)
I personally already had a Pedal Power 3 Plus (same as PP3 but with 12 isolated outputs) powering my board when I bought the QC, so I simply used a pedal cable and connected it to the X-link output. No problems ever and no additional cost to power the QC.