wfh today, went upstairs to go to the loo to be greeted by the sight of both cats on my bed back to back, touching. Definitely their choice to be so close together - they have their own bedroom with double bed, igloo (Tobias's favorite place), donut bed (Girlcat's territory) and a linen rack thing with piles of things like towels on it (Girlcat likes that too, only time Tobias is allowed on the donut bed).
My bed is full king size, so plenty of room for them to be as far apart as they want.