Google Earth Super-Overlay. You can Import or File>Open. The important part is to put the folder that receives the tiles they create in an intentional place. After the process you go into that folder and open the KML file. The KMZ's are the tiles. I find this easier than downloading the tiles from DroneDeploy since i already download the high-res ortho. I've gone as far to create a directory in our network with a master KML file that has individual project in subfolders underneath it.
For the overlay without tiling your best option is probably to install the Agtek app. It will produce the exact files you need including the KML. You just have to save all those files in the same folder.