Since F-Secure has launched more products I'm suprised there's no packet deals. For example a family package for X devices (X €/ 1 Year) and get for every member/device:
X GB storage in Younited
SAFE has an option to buy for 1-10 devices, which is good - but Freedome and Booster is sold only for 1, 3 or 5. If you happen to have 1, 3 or 5 devices then it's great - but if you have 2, 4 or more it gets trickier and quite expensive.