I havent tried the others that Msinger listed, but I have the Hooshion and I really like it. It holds my 10.1 Tab snugly, and is very quick to insert in between the rubber controller claws and stays in there really well. It is almost infinitely adjustable up and down, back and forth, and folds up nicely.
You will need to use a longer USB cable than the OEM one DJI provides because it will have to reach further. I use the USB port on the bottom of the controller to plug it in.
The biggest plus side for me was the difference between using my tab and S7. Using the tab is like watching TV and I can use it without using my reading glasses. Using my S7 after using the tab feels like Im playing with a Nintendo.
The only downside, as with any tab, is it might partially obscure your view of the controller depending on what angle you set it at..