Can I cook 2 cakes in the oven at the same time? Will it affect temperature or cooking time?
I have one cake on the top shelf and one on the bottom, both of the same size and same mixture. It’s a fan-forced oven heated to 160C or 320F and the recipe recommends I cook for 45-50mins. Does having 2 cakes in the oven make a difference? Will I need to adjust cooking time or temperature. Will I need to rotate the cakes?

You shouldn’t need to add much, if any, time. Rotating the cakes wouldn’t be a bad idea as long as you can do it quickly w/o the oven cooling off too much in the process.