Excellent question. I was looking for switched power and constant power. My hardwire kit for my camera (Thinkware) goes into Parking Mode when the switched power is killed but the constant power remains.
So the constant power was easy. I used F3 (Garage Door Opener), which is a standard fuse.
For switched power I used F26 (USB/SEO RAP), which is three pronged. There were other good options for the three pronged fuse, F11, F32, F43, or F17. I went with F26 because it was easiest to get my add a fuse into. I actually like the fact that it is F26.... it is a Retained Power Accessory circuit so it preserves powers for 10 or so minutes before being killed.
Here is a link to a helpful thread.