Fuge before skimmer is to allow the macro the chance to takeup the nutrients before they are removed forever by the skimmer. This works in conjunction with the lack of filter socks.
I don't know if I consider anything with Triton to be a "requirement" but every little detail adds up to the bigger picture. Having a larger fuge is probably more important then where it is placed in the sump. My skimmer is in the middle chamber and I have never had micro bubble issues.
I have fuge on opposite end from skimmer you dont want huge flow through fuge or it doesnt work as good just run a pump from skimmer to fuge so you can contol flow