Should a listing video be portrait or landscape?
Both: portrait 9:16 for Instagram Reels, TikTok and Stories; landscape 16:9 for listing portals, YouTube and your website. With Imoframe you can switch format afterwards — the video is re-cut, nothing to pay.
Vertical video fills the phone screen and performs best on social media. Portals and websites usually show a horizontal player.
If your photos are horizontal, landscape keeps more of each room; portrait crops the sides, so keep the important part of each room near the centre.