Setting other devices on plusnet protect

[#1]

Hi i have recently set up plusnet protect and have tried to add all the family's devices but the only thing i seem to be able to get protect on is my PC
We have 3 children and between us have an ipad, 2 Iconia Tablets and phones. I want to set parental controls to restrict what my children can do and see online but im sure i read somewhere that plusnet protect doesnt support tablets or ipads which seems bizzarre.... how can i ensure my children aren't viewing inappropriate content?
please help? 

[#2]

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how can i ensure my children aren't viewing inappropriate content?

Have a look at OpenDNS parental controls https://www.opendns.com/home-internet-security/parental-controls/opendns-home/ It's free and will cover any device that's connected via the router.