There were 8 of them in 2017 I believe, but there were also different food choices at the counter services. It also would not surprise me if they added one or two booths this year, as that seems to be their M.O. Here was last year's offering; http://www.disneyfoodblog.com/2017-epcot-international-festival-of-the-arts/
I'm in the minority but i HATED Columbia harbour house. Our food was nasty and cold, tasted very cheap. Pecos Bill was very good! didn't like the fajita platter but loved the nachos.
Yak and yeti is also a favorite.
Can't wait to try satu'li canteen!