New Home Studio: Question 1 - Best postion for backdrop?

I was forced to move a few month ago and was given a choice of apartments and took a much larger one and wanted to create a decent home studio.
My first question is on which wall should I place the backdrop? I bought a 10 foot wide frame and several 10x20 backdrops. My first goal is images without any shadows.
I shoot 50 and 35 MM indoors.
The area is 13x22 feet. Which side of the room would you recommend as with one I get more depth and the other width?

I'm envious of that space. If it were mine, I'd arrange it along the walls as such so that simply by rotating the center position, I could take advantage of both the length and depth.

If it were me, I'd put the backdrop along the 14' wall. That way if you get a longer focal length, you have room to back up. Plus you can position your model further from the backdrop so shadows don't fall on it.

thanks for the replies, I have started moving things around and found with the 8/4 o'clock positions for the two flashes I can get rid of the shadows.
I will spend this weekend finishing and post the results when done.