You can just get some ball mounts and an action camera or two. The new cameras have such good stabilization that a handlebar mount is very acceptable now. http

You can just get some ball mounts and an action camera or two. The new cameras have such good stabilization that a handlebar mount is very acceptable now. https://www.amazon.com/dp/B0BPMBL924 https://www.amazon.com/dp/B0BPMBL924 + a ball for the handlebar and a short extension. You can use the smaller ball size, it is still plenty sturdy.