One thing to think about is the USB 3.0 which most items these days require the higher output for fast charging. Here is an example of one with USB 3.0 that has a built in power switch. This model if wired thru a switched 12 volt source would need to be turned back on after every power cycle. There are other models that do not have the switch.
https://www.amazon.com/dp/B08LKRDG2T...mcd_asin_1_img