If you need 7 get 7 ip. If you get them one by one instead of ripe-block, you should be able to return them also one by one I think.
What about if i use 7 ips? not 16? I will pay fee next month?
Please read what is written on their website. You pay a setup fee and the first 16 IPs if mentioned with the server have 0€ monthly fee. If you don't use the IP there is an inactivity fee and you may loose the IPs completely.
Im thinking to buy an dedicaded server here but i need almost 7-8 ips for it i saw "Free 16 ips" its that true? but i search the forums i saw somewhere that the first month its 0euro then you pay fees? How much fees will take next month? for the 16 ips...