In my parents’ house similar to what you said, knifes and forks adjacent and spoons to one side (I don’t remember the exact order). When I moved in with my now husband he said it made more sense to him to have spoons in the middle and I didn’t care that much about it, so we have it like that. I have to say though, I do see an advantage to having the fork, spoon, knife order: when grabbing several pairs (fork and knife) it’s easy to just take each with one with different hands and count them out. And it’s easier once you have knives on the right hand and forks on the left to set a big table with one on each side of the plate.