Exactly computer reader means candidates are wearing headphones, but possibly not in a normal exam hall as they need computer access to the exam paper and computer reader software. (They could be using laptops though, with well charged batteries and in the exam hall).
We’ve had groups of 10 to 15 in a classroom.
Awarding body sends .pdf versions of the question paper these days, so you don’t have go through the fag of scanning them in like you did 10 years ago.
Suspect it’s not permissible for MFL – check with the regs.