Yes but the GFI outlets may need to ne upgraded. You will have a tight fit connecting the 10 Gauge wire to the outlet if you do not change outlets. I used 12 gauge wire and the fit behind the screw terminals was tight.
Yes. Has standard indent knockouts to tap out.
Yes they can.
In my opinion, it would take a very deliberate action and a considerable amount of force to pull the hinged door from this product. There is no comparison between this product and the plastic in-use covers. And it is also eaiser to wire and install than the metal in-use covers. I told one of my customers, who has had a lot of plastic in-use covers broken in a park, "Kick the plastic cover and break the door, kick the power outlet box cover and break your foot".
The distant from the face plate to the inside of the cover is approximately 2.5 inches not enough to place a transformer that is 4.5 inches high.
There are 3 openings on the bottom for running conduit. There is no threaded openings just knockout plugs. There are three 3/4 inch knockouts and a 1-1/4 knockout.
Yes that will work but I would recommend not sharing the neutral wire.
no but you cab easily remove tge 2 20 amp gfcis.... There worth $35 by themselves