Wow! The Tanya must really be heilig!! Not only a chumash, but they won’t even put Likutei Sichos or maamarim on top of it!
Ever heard of such a thing as a Leshitascha?
Even Leshitascha, that we respect the Rebbe too much, we wouldn’t have a problem with a Gemara or a Mishna, or a Ketzos, Nesivos, or Igros Moshe for that matter on top of a Likkutei Sichos.[1]
[1]. Do I get put in Cheirem for comparing a Mishna to an Igros Moshe? Or for saying that I’d put an Igros Moshe on top of a Gemara?