This is the power supply I use. 12V, 3.34A, 2.1mm, IEC cable input. I’ve been using this with my QC since day one and it’s solid as a rock:
…The power supply is center-pin-positive, so I use a reverse polarity cable to connect it to the QC. This one is rated for 3A:
I use a 3-prong Y-splitter on my Templeboard so the QC is powered by itself, and my other pedals are run off of a Voodoo Lab Pedal Power Plus 3.
I don’t know enough to say whether the Crux inherently has a problem such that it can ruin a Quad Cortex. But I’ve never had to deal with power issues at all using the stuff I mentioned above which costs like $30-40 together.