ExFat won't be good for Calibre.
You used to be able to get NTFS drivers for Mac. Linux Calibre *might* work with NTFS. Linux has no problem using NTFS.
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There are a lot of warnings about multiple systems modifying the same Calibre library.
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Yes, asking for trouble. But if you are using only one Calibre at a time and it's a local disk most of warnings won't apply.
Sell the Mac and get a cheap S/H AMD for Linux, or forget Linux and only use the Mac. It's not cost effective having Mac HW to run Linux.