I have a similar setup for my Mavic Pro controller.
The reason for this was so I could still see the details presented on the controller without the tablet obscuring it. It doesn’t get in the way of the antennas .
The only issue I see with this setup is that it mounts to your controller by being wrapped around it and in my case , the air vents get partially obstructed .
+1 for MavMount. Not the cheapest, but beautifully made with quality materials that will resist the wear/wobble that sometimes affect cheaper types.
Has accessories available too and arrived quickly from the US.
I use this with my Mavic Air and works really well. Probably not as well built as the Mavmount but quite a bit cheaper. The plate locks in well to the controller and all fold up really well.