Like everybody else here said…audiobookshelf is da bomb. I had an audible subscription for a while and found myself without the time to really listen to enough audiobooks to make it worthwhile so I cancelled. I know I could still access the audiobooks I purchased but I’m always concerned with these companies suddenly having a disagreement with a publisher and nuking a whole pile of media I paid for so I figured out how to download my purchased audiobooks locally to be listened to via audiobookshelf. Worked great.
I first tried zerotier but ran into some weird issue…don’t recall what it is now…and then tried tailscale and was up and running in like 15 mins. But I see others have had the absolutely opposite experience from mine where tailscale wouldn’t work and zerotier would. I think they’re both great products.