How to prepare for an online interview for a professorship position?
I interviewed candidates in the US for a similar position, the number one non-academic tip is to pay attention to how you appear on Zoom, and go for a professional setup. I was surprised how many candidates were speaking in a relatively dark room with a visible bed (even an unmade bed) behind them.

Look at the camera, not the screen
Find a relatively solid, professional, not distracting background
Light yourself from the front
Make sure the camera is raised to something approaching the level of your head

If possible, do a practice interview on Zoom first to prepare.