I have considered recently with the help of many of you on this forum.
The speakers and the listening point form an equilateral triangle with each side measuring 3 meters.

Slightly oriented to the listening point.
Side pic to show the 50cm between speakers and wall. This is for the moment the best distance to my ears. Things can maybe be improved.
One easy and free improvement has been the positioning of power supplies far from the TT.
The amp is 40cm far from the TT. The streamer and its power supply are a bit closer but I have noticed a real improvement with the heed power supply on another shelf.