In Wall TV Power Kit with Surge Protective Outlet White

You can plug anything you want into the AC receptacles. If you need more space for power supplies, consider the ENP0900 or ENP1700 enclosures. Legrand AV's Chief brand has the PAC series of in-wall enclosures that are designed more for the commercial space.

The included receptacle is a TR5262WSP. Please see the attached image for more information about it.

Six feet.

2.938 wide by 4.688" tall

You use the lower brush plate. Hold it flush against the wall and trace the gaps between the widest areas of the plate. Remove the plate and using a straight edge join the lines.

If you are referring to the Sanus SA-IWB17 17" In-Wall enclosure, then there isn't really a reason to use this product with it. You can use the existing knockout holes in the 17" enclosure for low voltage cable entry (HDMI, Audio, Ethernet, etc). For an outlet kit to go inside the enclosure, look to the following part numbers: 364569-02-V1 for a surge protected outlet https://www.legrand.us/wiring-devices/outlets-and-receptacles/power-outlets/surge-protected-duplex-power-kit/p/36456902v1 -OR- F7526 for a standard duplex outlet https://www.legrand.us/audiovisual/data-connectivity/low-voltage-brackets/duplex-power-kit/p/f7526?text=F7526