Look for the RAWeb tool (
https://github.com/kimmknight/raweb) and get that set up. Then set the RDP tool up to connect via RSS to the website created in the RAWeb tool.
That is what I did and it worked great.
Things to note though - RDP does not expect a touch screen device and as such the mouse cursor may not operate as you expect. When you tap on the screen, no matter where you tap, it will treat it as a mouse click at the position of the mouse cursor NOT where you tapped. Sliding your finger around the screen moves the mouse cursor.
Takes a little getting used to, but not too bad once you do it a few times. That being said, RDP from a 6" screen is hard on the eyes, fingers, and mind. I do not recommend it. Even a 10" tablet would likely be small and annoying to RDP from.