If you're unable to mount it, I don't know if I have too many suggestions to offer. That's a tricky spot. My only real idea would be to buy a long and low table that could partially go underneath the bar counter. Then set the TV on it off-centered.
Maybe a piece something like this. https://www.amazon.com/Modway-EEI-3303-WAL-WAL-Render-Entertainment-Center/dp/B07MTNQBCW/ref=sr\_1\_3?keywords=Low+TV+Console&qid=1647395666&sr=8-3
It's veneer over particle board, but the veneer is decent and has some depth to it.
https://www.amazon.com/dp/B07MTNQBCW?psc=1&ref=ppx_yo2ov_dt_b_product_details
Oh, sorry! Lol
Modway Render 70" Mid-Century Modern Low Profile Media Console TV Stand, 70 Inch, Walnut Walnut https://www.amazon.com/dp/B07MTNQBCW/ref=cm_sw_r_apan_i_15J0CBYTJ32J947WP5ZH
Here ya go