A centrifugal lift pump and a gear driven radial piston injection pump are 2 totally different pumps. I have seen Kennedy pumps burn up because people put a FWS filter before it then fill up with a bad tank of fuel which plugged the filter therefore the pump ran dry and died. That is why with Kennedy pumps you put the filters after it. Centrifugal pumps are better at pushing fuel than pulling it. The filter after the Kennedy will still do the same job and ensure long lift pump life.While the logic sounds good, it doesn't hold up in real time pressure testing I've done. The filters involved have very little pressure drop. The CP3 can pull thru 3 filters with NO lift pump involved. It's doubtful the little JK pump would be strained, routing it one way or the other.
The pressure drop between a fresh filter and one that's at end of life is only 2"Hg. It will work either way, before or after. But a FWS filter is most efficient when the fuel is pulled thru it, not pushed (per Baldwin). This is how your stock fuel supply is set up.
When you do add a LP, including an aux filter head for a FWS before the pump, maintains that efficiency, and greatly improves the life of the under hood filter, which is now your secondary filter. One from being downstream of a 10m filter. Two, positive pressure thru the stock filter will utilize more of the full media, with no voids left, which you'll find under vacuum use.
Height location isn't much of a concern. Per JK, what kills the pump is trapped air from not priming properly. It leaves tell tale internal wear marks seen when they open it up for warranty. And he states that if they find those wear marks, any warranty is voided.
Summation; there's no wrong way to mount one, just a better way than others.