Some people angle the bridge a degree or two. Before saddles adjusted this was the only way to intonate. I don't think you have to do that with the Babicz unless you want to. In Cliff's video the installer just uses the holes that from the Fender Bridge he's replacing.

What I would do is put the G string saddle all the way toward the neck, then back it off a little. You should have a little adjustment toward the neck but you won't need that much. You can look at your P-bass and put it more-or-less there. It does tot have to be precise.

Measure from G string saddle to the middle of the 12th fret to get bridge placement. The measurement should be the same as from the bridge-side of the nut to the center of the 12th fret. This should be the only saddle you need to worry about length on before you mount the bridge. If it were me, I would not angle the bridge. I don't have a Babicz, but it looks like the E will have plenty of travel to intonate whether you angle it or not. If you do angle it, 1-2 degrees will be plenty.