Anything past 6 or 7 inches will require come good ol custom fabrication. I'll post ya a pic of my camry dash that i put a 10.1 in monitor into. But basically you'll just buy one of these cheep metra kits
Some bondo and jb weld, and shape it around your tablet anway you like, even install the 3.5audio and charging cable built into the dash eh, so it doubles as a real dock. But that kit is as close as your likely to find to what you will need to change to.