I have remodeled a few boats and always just get mine at Menards. They have a few different styles and colors so choose what you like. It’s all pretty cheap.
I glue mine down with Super 77 3M Spray adhesive. Just be careful on the carpet and don’t oversaturate it or it will bleed through. A couple light coats on the backing and a single medium coat on the subfloor works well.
My biggest tip is to glue the main area first, then cut and trim the edges and wraps and glue those afterward.
Also research how to wrap and cut the corners properly, it will make install much easier. I don’t have the time right now to find the YouTube videos I’ve seen but there are a few out there. If I remember and have time later I will try and post them.