Advice needed on the best way to plant spuds in a raised bed

Hi guys

I no this is a stupid question and I'm over thinking things but this is my first year on my lotti. I have raised beds on my allotment and will planting spuds in one of them.

My beds are 4.5ft wide and 13ft long, is the best way of planting spuds two rows to a bed or do you think I could get three?

Any advice welcome.x

Thanks.x