Hi Mattimus we have developed a multi camera photogrammetry rig with turntable for the museum industry (www.cyreal.com). If you want to simply fire and tether the cameras to a PC I would use software called Smart Shooter https://kuvacode.com . If you need any more information about setup send me a PM.
It’s not really an issue with Canon, just Nikon, unfortunately.
This old but still relevant article really illustrates the issue. I had the same results when I tested on my d7500. That kinda compression will kill any chance of getting planetary detail.