I'm hardwiring my dashcam into my vehicle after getting sick of the power cable dangling down the center. I have everything run, but want to ensure that I am using the fuse tap (pictured below) correctly. I believe that if I have a fuse tap, the power wire from the fuse tap to my device should be on the zero-voltage-relative-to-ground side of the fuse column. For example, in the below picture, the power wire to my dashcam should be on the right. If it were going to the left, the power for the new device would first have to cross over the original fuse, and then through the new fuse.
Additionally, just as a side note, is it a safe bet that the hot and cold side of a fuse slot will be the same the entire column?