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If you want to keep the strong colour of the stems in winter, you should give the cornus a harsh haircut (down to 15cms / 6ins) every spring. So I'd put 3 in there, with plenty of other things towards the front of the bed to keep seasonal interest. You need to keep dogwoods pruned down regularly every year, or you will lose the brightly coloured stems in winter (they'll go a dull brown colour).
I agree with Mummy Muddy Paws, plant all three, because they'll look beautiful when everything else has died back in Autumn and Winter. However, in my dads garden, they got too overgrown (due to him not taking much care) and then they got this white fungus, which I later found out was due to lack of air circulation, so make sure they're not touching eachother and keep them pruned
Yes, plant them all.