Madison Electric Products MSB4G Four Gang Device Box with Depth Adjustable, Heavy Duty 42lb

There are no cable mount screws or brackets. How do you keep a cable from being pulled out? What is the best way to cut the cable openings?

will a CGFI outlet fit in this box?

W/outlet & switch installed via the device holes (this box in an exterior wall), a weatherproof cover could install via holes of the outlet/switch?

Is it the price for just 1 box?