I think the main thing is - as
@trs96 says - disconnect MacOS drive when installing Windows.
Apart from that, I consider it sound advice to not leave the MacOS related disks on when running Windows, and vice versa. Main thing you want to avoid is to write to, or select, the wrong disk when doing something irreversible - like a format. If the disks at peril are not powered on, you're safe.
I opted to solve this predicament using one of these:
https://www.amazon.de/gp/product/B07MXBKGW4/?tag=tonymacx8603-21
That way, I can actively control power on/off of individual disks without opening up the PC. Worth it? Depends on how many times you need to boot in either OS, and how much free time you have to fix any cock-ups if you make a mistake
For me, it's worth every penny as I want to use my computer time on accomplishing things with it, not recovering it because I screwed it up ;-)