How about pinksale or poocoin or similar platforms where you can do your presale or advertise your product? What is your opinion on those?
Keep in mind that I don't work in advertising and such. I've just gave you some advises that looked logical to me.
I don't know those platforms you said, it's the first time I hear about them.
If by provider you also ask about campaign manager, there are plenty of good campaign managers available for hire if that's what you want, I also advertise one of them, you can look at my account's avatar, or, directly:
https://bitcointalksearch.org/topic/available-bitcointalk-campaign-management-signature-bounty-5328445
They can help you, but they will most probably not endorse your project, hence you'll need to start with an ANN made and posted by you.
Then you'll have to find somebody design the signatures. And only afterwards you can do signature campaign (or other bounties).