Sign up to as many as possible - the more the merry and the easier it is to hide BH methods if spread across multiple networks.
Secondly - have a half decent website that you can point them to to look at, either that or make sure your PPC story is well thought out and sounds plausible. They will want to phone verify you more than likely and confidence is the key here.
Remember your AM wants you to do well, and wants to believe everything is above board - so if you seem legit, act confident and give them no reasons to look too closely at what you are doing you can get away with way more.