When you use the top of the Fuse Block
When you use the top of the Fuse Block on top of the battery you have to check that there are fusible link blades in the slots you are thinking about using.
Some cars come without fusible link blades in some of the slots.
I would just as soon bypass the fusible link connection points . If you blow them you have to replace the whole fusible link assembly .
The links have different capacity's I think there is a picture some where with the actual amp ratings for each one.