Since my N5 ist a NAS-Model (5 bays) I decided to go with ZFS. You can even select ZFS for a (the) single boot disk. This is mine e.g.:
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Ah, just saw you other post. I only wanted to point to another way to choose of during install. Seemingly that (ZFS) worked.
Be aware that PVE has a habit of wearing out (cheap) SSD pretty fast. Mine "AirDisk" above is now down 26% in half a year. At some point it has to be replaced with a better one but for me that's ok.
Also be aware that during testing PVE you could easily come to the decision to better reinstall with different (disk) settings.