Because it’s rental it’s difficult. Also a door either side of the fireplace is fucking with the ideal. TV in a corner would give so many more options.
For the hifi the ideal would be to have the kallax and the amp on the blank wall and the speakers either side of the fireplace but there’s a door in the way and you won’t be able to run speaker cable through the walls of a rental.
For the tv it’s difficult with the fireplace because facing the fireplace is the only sensible place for a long sofa and above the fireplace looks naff and will give neck strain.
The compromise, as much as I wouldn’t like it, would be to have the set up as it is in your current space against that now blank wall. Have a sofa facing the fireplace and maybe a comfy chair for your solo tv/listening facing the tv and hifi.