what i mean is all subs in one box, but the box split into 4 sections, you will damage the subs if they all use the same single enclosure
if you dont care about space, you could always try and fit them into a ported box (1 box, 4 sections, 4 ports)
all i will say is, you paid £60 for two, they will sound like they cost you that, better to spent £120 on one good one, you would have noticed the difference, all the vibes will do is make a noise