With ANL fuse holders, you are talking about DC devices that may be required to interrupt a lot of
current (energy). The Blue Seas units are tin plated and less susceptible to
corrosion than many. They are also very conservatively rated for the current that they may have to interrupt.
I expect that there is nothing else between your
batteries and the load than these fuse holders. As a primary 12 Volt DC
service, I fully agree that you need to have something UL rated for the application, and the Blue Seas unit fills that requirement.
Short answer - get the Blue Seas holders or have a solid reason (other than price) not to do so.
Cheers!
Steve