RSo:”where is TT in all this”.
I posted a response, but I guess it didn’t pass moderation. I’m not sure why.
One point which I will try to get through here: you asked whether a Tanya may not be placed under a Sefer Torah, and were told of course it may, but from your response afterwards you seem to be talking about a Chumash, not a ST. The Rebbe would famously take Tanya’s from on top of Chumashim AND Chumashim from on top of Tanyas.