Is one allowed to put a sefer on a chair in a flat or upright position? Also, is one allowed to put a sefer on an ottoman when one’s foot are not on it?
We are allowed to put a sefer on a chair that we are not sitting on flat or upright, however if someone is sitting on the chair at that time, it should not be put there.
Y”D 287 -7 Shach ibid, Aruch Hashulchan ibid 12. Ginzei Hakodesh in the name of R’ Moshe Feinstein, R’ Eliyashev and R’ S.Z. Auerbach Zt”l Also see Oz Nidbaru vol 1-4 if it will cause Bitul Torah.