Firstly, as long as the connection to your AD/AHRS is reliably airtight, what difference does it make how it looks?
Secondly, at the risk of hijacking your thread and starting a minor controversy, I'm wondering about the value of a dual AHRS system. It seems to me that having dual AHRS offers little value for most failures --outside of an outright failure. AHRS being solid state systems without any moving parts, I would think outright failures are the exception and discrepancies the norm. Typically if you want redundancy for this type of system, you would need THREE AHRS! Having a third AHRS unit would provide a tie-breaker. Without a tie breaker you would need some extraordinary algorithm (read guess) to determine which unit is at fault.
So it seems the only reason for a vendor to promote a dual AHRS system is because they are not confident in the quality of their AHRS product. I think this is why all of the certified systems are certified with either ONE or THREE (think Boeing) AHRS. With a single AHRS, it is either working, on not. If not, you rely on external backup instruments. With DUAL AHRS, how exactly, outside of a FULL failure, can you be sure which AHRS is giving you the correct information and which one is not? While it is good to have a back-up for most items in aviation, somehow, DUAL AHRS doesn?t pass the surface test. DUAL AHRS seem to make sense on the surface, when you peer behind the curtains however, it reveals more questions than answers.
How does a DUAL AHRS system arbitrate between units to determine which is correct without a tie breaker? It seems the only value of a dual AHRS system is if there is a clear-outright failure of one unit. Otherwise, any algorithm is only guessing as to which unit is correct when there is a discrepancy. Potentially this is a worse scenario than if your single AHRS had an outright failure. Without a third arbitrator, you would be using information of a bad AHRS or ignoring information of a good ADHRS, or integrating good data with bad data. So what am I missing?