MaM is the absolute best for audiobooks IMO. Always have what I want, a friendly and helpful community and from what I hear the most forgiving private tracker around.
I use myanonamouse. Had to back then, none of the public trackers were good. Sounds like they might be better now though. MaM is the only private tracker I'm on.
Right? I see lots of people recommending MaM for audiobooks, but not allowing VPN during the initial registration process is a hard no for me. Oh well.
If you use something like Jackett or Prowlarr, no. If you use the web interface, yes, but they don't verify the email you enter, so you can just type in a random one.