Garmin Striker 4plus Mount

Just bought my first kayak, ascend 10t, and am looking for ways to mount the fish finder to the center rail. Needs the be removable since I car top the yak. I’ve tried searching the forums and the internet myself, but being very new to it, it’s all above my understanding level. What all do I need to buy to get this up and running. I already have my power source.