I would recommend growing shallots from seed in exactly the same way as onions. Approx 6 seeds per module will give you a harvest clumps of up to 6 shallots, depending on germination. I would space them the same distance as Charles advises for onions, make sure there is enough space to hoe in between the clumps though! One seed will produce one shallot at harvest time, although when cut this may have started to divide internally. Planting a set will give you a clump of shallots. With multisowing you will end up with a heavier harvest of bulbs than from single plants, but the bulbs will be smaller.
If you are trying to grow big onions from Kelsae seed then you could try 2 seeds per module, thin to the stronest then plant out in April. This would give you the biggest size bulbs, but perhaps not the most productive use of the ground!
I would thoroughly recommend multisowing of this and other crops. Beetroot is extremely productive when grown this way.
Andy
