On my bike that is unfortunately not the attachment to the handlebar has not convinced me. The -Edge is constantly slipping, also all looked not particular good. While Garmin has a bracket to Aero, but the price of more than 30 has put me off. Also Ebay, the original holders went to new heights.
Since I have been actively involved with plastic parts I can roughly estimate what may cost you.
Although the SRAM holder is too expensive, but still in the pain threshold. This part is processed cleanly, fits well at the handlebar and the Edge budge. I have only the supplied Torx screw replaced by a hexagon socket to not take more tool.
Even now fits a bell behind the Edge, without having to drive with us here is quite tiring.
I highly recommend this product, delivery from Amazon as always top.