I use drop bars, I have no clue how your bars would work with a handlebar bag.

I have a separate bike computer (wheel sensor and cadence, no GPS) on the stem, a HRM, a bubble inclinometer, and of course a GPS (general recreation type, not cycling specific). And of course, a bell to let people know I am approaching.



Photo below, different bike but the same bag, GPS, etc. Nice place for small items to get lost. My phone is typically off or in airplane mode when riding, that is in the handle bar bag.



I prefer to mount my handlebar bag lower and closer to the steerer tube. I use a second stem to do that, more on that at this post:
Racks/Bags and Interrupter Levers

I like a handlebar bag that easily disconnects so that I can keep my valuables in it, and take that in stores and restaurants with me on a tour.

More on this topic here:
Let me see your cockpit..