Code check: Installing a garage security flood light

Question

Below is my current understanding of end-to-end project for installing a garage security flood light. Wonder whether this is NEC 2017 code compliant or not. Any suggestions/recommendations are welcome!
Context:

An outlet is protected by 20 amp breaker
There is no attic access (another room above)

Outside:

Install 4 in. PVC Round Weatherproof Box with Five 3/4 in. Outlets
Glue 2 male adapters on 6" PVC and stick it through the wall
Use THHN to go from the round box to a junction box
Use 3/4 in. ACC Non-Metallic Strain Relief in central outlet [goes into a wall]
Use UF-B 12/2 cable to go through the wall

Questions:

How to screw something to the external wall like this (with and without a stud)?
Should I cover all 4 remaining outlets? Or should I leave the bottom one open?

Inside:

Use Wiremold 700 series to extend a ceiling outlet (protected by 20 amp breaker), use it as a conduit and a junction box
Use 12/2 THHN wires from the outlet to the junction box
Use UF-B 12/2 cable 12/2 THHN wires to go through the wall (in PVC pipe)

Questions:

I would like to have an ability to turn off this security flood light. Is it allowed to install a switch in unreachable location (> 9 feet)?

Ed Beal · Accepted Answer

A surface mount box can be attached to the exterior siding (what is the siding?)
In some cases I like to cut the siding an inset the box and screw it to the sheeting
OR cut through the sheeting and make the box flush mount (old work box could be used in this case).
Since you have the UF a surface mount is fine I usually use 2 screw clamps, cheaper than a CGB and 2 screw clamps are listed for the UF. a CGB may or may not be listed for use with flat cable it depends on the seal some are hard plastic and those are not on the ones I have used and some are a soft neoprene and some of those are. But I would use the cheaper 2 screw clamp.
All the unused holes are required to be plugged if you are concerned with water accumulation it is acceptable to drill a drainage hole in the bottom of the box.
The maximum hole size is 1/4”.
As far as height NEC 404.8.A  all switches and circuit breakers used as switches limit the switch to 6’7”. There are switches that can be up high but these are a specific type not a common snap switch.

Code check: Installing a garage security flood light

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