Shalom, based on what this article is saying it appears I can place a siddur on top of a shulchan aruch? Seeing as a siddur is considered to be similar kedusha to nevvim and shulchan aruch is similar to gemara. Or perhaps I am mistaken. Thank you

Shalom, You are definitely correct. You may place a siddur on a Shulchan Aruch. You may also place a Shulchan Aruch on a siddur (Harav Elyashiv and Harav Chaim Kanievsky. Although some hold that you cant put a Shulchan Aruch on a siddur (Harav Karelitz, see Ginzei Kodesh chapter 3:30). All the best!