Hi and welcome,
The majority of the time the creditors all agree, but sometimes it depends on who your creditors are, some of them can be awkward.
Not sure about the IP keeping the first months payment if you don't get through.
Creditors can make you bankrupt, but it very rarely happens as it costs them a lot of money, so I wouldn't worry about that.
If the worst comes to the worst and they don't approve you, you will be back to square one with the creditors hounding you again.
I can't help you with Synergie, but if you are unsure about anything, I would contact another IP company to find out how you would do with them. Visit
www.iva.com or you could speak to one of the experts who post on here. Melanie Giles comes highly recommended. It wouldn't hurt to get a further perspective on your situation.