I have the same model as an EDF.
I don't have an upward tilt on my thrust tubes, just straight out the back, centred.
I rolled the exhausts using mylar and the cone software to generate the pattern.
For my inlets, I cut two discs out of plywood, glued these to some polystyrene blanks and sanded the foam. These were then glassed.
The model flies perfectly fine in this configuration

Chris