We are planning on creating a recessed coir door mat in our new entryway. Inspiration photo:

The coir is easy to replace when worn out.

I could use some help deciding the optimal size of the mat, as the area is a little tricky, with a mudroom doorway nearby, plus a sidelite panel that I'm unsure how to take into account. Here is the entryway in question (from the kitchen area):

Which of these 3 coir rug sizes works best?