I think a 10.1 inch piece of black cardboard would be a reasonable mockup screen to check fitment and finesse now that you know there's no buttons and such as interference. (the touch buttons are all along the drivers edge, top to bottom)
I use mockups a lot.
AND
Some units newer than mine rotate 90 degrees and tilt about 30 degrees and they adjust left right up down by about two inches so they needn't be centered to the radio hole.
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