score:4
If it's clear that the computers are for your personal use, and are reasonable, I don't see why you should have any problems. One laptop per person is certainly reasonable these days, and having a second one for one of the travelers, given that it's a work machine, isn't at all crazy either.
If all three machines are brand new, in boxes, that sounds like you're importing them for resale :) but if these are clearly used, and the story makes sense, you'll be fine.