Yes, it car audio mostly. I like the marine fuse that you show, My only concern would access, for my house battery getting to that would be a challenge, so if you are OK with access then it should work fine, and even then for this application probably not a issue. The only other drawback is that you can't find them just anywhere, but I don't see that as a huge issue. I think the 30 amp would be fine. Bluesea has a good circuit wizard
http://circuitwizard.bluesea.com/# You can even get it for your smart phone.
I see that we are relatively close, I usually use the West Marine in Tigard. Feel free to reach out if you run into issues, it does not sound like you will.
greg