I have transported my BV Avant 32 few times and always upright position.
I’m not sure if it’s wise to turn it lying on side because of weight. Flatscreens are more tolerant I think and easy to separate from stand.
Moved BV9 (120kgs) alone from trailer to living room. Took a while but with round wood pieces, carpets, books! (few stairs) etc. went fine:)