Have a look on line for the Ram Mount products. I've never had much luck with the suction cap types, however this company gives you HEAPS of mounting options.
Basically they consist of a mount, an adjustable arm then the cradle. I suggest the form fit cradle. With this combo, you will NEVER loose your phone in flight!
I have an Iphone 6S mounted in a cradle on the far left side of the panel of My RV7 and an ipad mini in another on the far right hand side. For a panel mount, you can simply screw a ball mount to a spare piece of real estate (I ended up using an instrument panel mounting screw). You can also buy different length arms to get your geometry spot on. They are also VERY sturdy!
Might not be the cheapest option however they are simple, very adjustable and well constructed.