David68
I have a 38 that I originally built with G-38's.
Then several years later upgraded to DA-50's and matched the mounting thrust lines from the G-38's
I do not have them counter rotating and they are mounted both the same way without additional "thrust" as a consideration.
Thrust is an issue for the ground only - it pulls hard left during the low to high throttle transition on roll out, but it flies like a dream an it lands like a dream.
An onlooker posted this video of a take off showing the left thrust issue you can expect if you go the same way.
https://youtu.be/Zx7qstFNJg8?list=FL...P_IelBiO4ICITQ
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"For thrust consideration in the air" I recommend an on-board gyro as a much more sound and solid decision for potential engine failure