The five dollar metal one off Amazon. Laptop stands are helpful too.
Textbook Stands,1PC Fold-n-Stow Metal Bookstand,Music Book Easel Display Holder,Adjustable Reading Stand,Small Book Rest for Kitchen Counertops,Bookrest for Hardcover Ipad,Cookbook,Recipe (1) https://www.amazon.com/dp/B09KMT9LXN/ref=cm_sw_r_cp_api_glt_fabc_7EF5993XVKRGH2569W9M?_encoding=UTF8&psc=1