I have always stood where the gabbai instructs me to stand. This avoids problems and possible insults to the minhag of the shul.
When I belonged to a Nusach Ari shul (non-Hasidic) they would leave the sefer torah rolled and covered on the bimah, so we stood to the side.
In the Litvak shul I grew up in, the sefer torah was dressed and put into a stand before haftorah, so we stood in the center of the reader’s table.
In my zaideh’s shul they leyned haftorah from a klaf so you had to stand in the center of the bimah in order to spread the scroll.