IMO, we should arrange the filter outlet and inlet in the way that the flow circulation can reach all parts of the tank and avoid "dead points" where water current is not there. By arranging like that, fertilizer and CO2 will be distributed all over the tank, hence plants will grow better and also partially prevent algae to develop.
So, it is up to your hardscape arrangement to arrange inflow and outflow pipes accordingly, with the main purpose as said above. I think with the low-profile tank of yours, total filter rate about 600-700l/hr should be sufficient. Since the tank is long, you can have 2 smaller filters like Eheim classic 2213 or Eheim Ecco Pro 130 (save energy in longterm using and no need to buy additional double taps to adjust the flow).
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Good points!
Hope to have the tank this weekend guys, first starting point!