My recommendation is to go with the best PI unit that you can get. This is no place to skimp. I have seen under ground faults from one pedestal To Another causing very high voltage to enter the RV and did considerable damage. I personally have the best that PI offers.
My PI unit plugs into the pedestal and hangs right there. I have had it for over 15 years and it has never been stolen. I personally prefer the portable one rather than the hardwired unit.
I have the PI 50-C. It was about $400.15 years ago as I remember. It is worth every penny.