I use a homemade aerobar that includes everything right in front of me premounted...headlight, video camera(real camera not a GoPro piss of shaving cream), cue sheet holder(aka unactivated smartphone), extra water bottle and food bag...all right in front of me mounted on two extra hand position all in one bar.

For the smartphone...it velcros on to the upright of the 45 degree hand hold bar position right down at the base of the aero bar. I use a piece of old election sign(choroplast) that is shaped right around the phone with the top and front cut out. The top is cut out so I can take the phone out and recharge it or update the cue hseet. The front is only partway cut out so I can see the smartphone naturally. I put the stupidphone in a plastic zip lock bag and drop it on down into the cue sheet holder and velcro it in place and go ride. I'm only using it for cue sheet directions only and nothing else, hence why it is an unactivated phone and will stay that way. I try to limit the tracking devices that I have around me when I ride. Everybody and there brother, including big brother doesn't need to to know where I am at every minute of every day. Screw them.

How did I come up with the idea...I looked at how I wanted my system to perform and made it that way. Only you know how you want things to work. Go make your own system and modify it until it works the way you want it to work. You'll end up with a much better product than anything you could go out and waste your money buying...because it is made for YOU...not for someone else.