Not sure i can really help you. In fact i could have bought any of the Evotech system as I am using only the lower part which is the same on all mounts.
Then, the tablet holder is a standard piece from Ram for 8″ tablets. In between I used bits from a Gopro holder I had and I hand made the rest.
This said, once in place, the tablet doesn’t look that big, and you get quickly used to the confort of the 8″ screen.
Tiger 900 RP