I've had 2 mounts and phone cases from a company called UltimateAddons.
They do lots of different bike mounts and charger kits. Thankfully I won't need a charging kit this time, due to our USB socket.
I'm going to get the ball mount that replaces one of the handlebar bolts. With our clock being off set to the right, the top left bolt should be the perfect location.
Ultimate Addons do waterproof cases for all the iPhones and the major android phones. The case for my iPhone 4 was perfect, the one for my iPhone 5s let in a tiny amount of water once and required some modification to work, as it was designed for the iPhone 5. So I'll get a new one for my iPhone 6s. Too bulky for everyday use but great on the bike. The 3 prong mount they use is very secure and simple to use.
I'd use something like a LifeProof case but it isn't waterproof with a charger plugged in, which makes it useless on the bike.