Ideally you should be staggering the boards so on one side you have two boards joining with a support underneath and then a complete board on the next row crossing the joint so the support is supporting three boards. Dont forget that the boards are tounge and grooved so they have their own strength on the joint and dont necessarily require a support under the joint. Infact I would think you would be lucky to have each joint directly over a support.
So looking at the job horizontally each row of legs is supporting two rows of boards. Of course you could position the legs in pairs so there are two legs under each row but I think that is overkill and would add to the cost of the job.
As I used the 2.4M lengths of board I didn't have the same issue but can understand your concerns. Have a dry run with a few boards and supports first. There are some youtube cllips covering loft boarding showing installation to maybe give you an idea.
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