One, then hang to dry if you want. I use extra long, 48 or 60 inch mats.

Mat, but just one, smaller than any of the options in your photo. If dripping is minimal enough that you're considering no mats, there's no reason to have three, and the one should just be big enough to step out of the shower onto. Putting them in front of the toilet and sink is asking for more laundry, especially if kids use this bathroom!

One. We use the terry mat that matched our last towels, and hang on a hook between showers.