I have had a Samsung Galaxy Tab 10 inch in a RAM MOUNTS Universal Tab-Tite holder for 10 inch tablets in my vehicle for years. Mounted using B size ball ground plate and double socket arm. Just bolted the ground plate to an asolid anchor point in the cockpit. I have been very pleased with the solution. The tablet was super tight in it even when the route was getting rough. First with an Otterbox around the tablet. When this was older and the rubberframe was not so good anymore, I used it still about 50,000km or 30,000miles without cover in the holder. Worked also perfectly. Without the Otterbox the holder was then a bit too big, I padded it with foam, simple and good.
So, when I got my new Samsung Galaxy Tab Active Pro last year, with which I am very satisfied (I have described elsewhere here already), I only exchanged the holder for the tablet. After the good experiences of course again a RAM MOUNTS holder. This time the special Power & Data Dock for the Samsung Galaxy Tab Active Pro. That one is really again another improvement to the universal holder Tab-Tite. The tablet holds perfectly, even on rougher routes. Charging and data port integrated. I like it very much and I am looking forward how it works on long-distance overlanding travel, as soon as it starts again! I like to report! I have currently no photo of that setup. Will take a photoshot the next days and upload it here if you like.
For me this setup works so perfectly and it is worth the money to me, someone else is maybe satisfied with another, simpler solution. As always, we can only exchange experiences here. Feel free to ask if you have further questions about the setup.