Running a Debian VM with Docker solved all those issues for me. I set the arrs root /data folder on my NAS to mount with CIFS at boot. It works so well with a ceiling of 4/8 cores and 12GB RAM I’ve moved all my containers to it and mostly just use Proxmox for monitoring and reliable backups/images over NFS.

The only issue I’ve had in the last year or so took me about 30 minutes between realizing something was wrong and fixing it: Make sure you put your CIFS credentials file in a folder accessible to Debian’s main user account or a power loss will break automount until you re-establish the link with a root user. Or create a locked down arrs-only user on your NAS so the CIFS command can include the username and password with less concern.

Calibre is highly regarded and works well with nearly all e-readers afaik. It has a local server option for browsing, uploading/downloading, and community extensions.