I am getting ready to prep my fiber based 10 x 10 and 15 x 15 editions for sale. I have a large 500T mount press and want to figure out how to store prints for sale. Am I best off at least mounting them to board? What kind, thickness? I have also noticed that even though the format is square, some artists are selling them mounted in 18 x 20 matts despite it only being a 10 x 10. It is standard practice to use a longer dimension on the vertical plane and is it typically centered or favoring more matt on the bottom on a square format print?

My three print sizes for now will mostly be 10 x 10 and 15 x 15 and some 8 x 8's, what is customary in this format and what is the best workflow for editions of 45, printing in quantities of no more than 20 at a time?