AVS Special Member
Join Date: Dec 2003
Location: Bethesda, MD USA
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The RA dimmers will work in metal. The faceplate is plastic, so there's your radiating point. I'd imagine a metal box would be less convenient.
Is this new construction? What size is the house?
RA2 speaks from the switches to their paired main repeater. You may want to test things to make sure your placement of the repeater(s) is going to provide effective coverage. For up to 100 devices you can use 1 main repeater and then another 4 auxiliary repeaters slaved to it. For more than 100 devices you can add a 2nd main repeater and, likewise, another 4 aux repeaters. The aux repeaters can be up to 60' from their paired main repeater. It's also possible to hard-wire a link between them.
If you've got any switches that are more than about 30 direct feet away from the repeater you may need to either move it or add an aux repeater. I moved our two main repeaters to the 1st floor office closet, a location about dead-center in reach to all devices. It had been previously placed in the basement, about 1/3 from the front, but hard to the left side of the house. A few dimmers in the second floor master suite were intermittent in getting programming. They were about 50' from the repeater, drawing a direct line. The new repeater location puts them all within 40'. That 10' made a difference.
Perhaps you could rig up a few of the most distant devices and make sure they're functioning as expected.
If not I'd still lean toward using a different location or aux repeaters. Why? Because plastic ones are notoriously crappy at presenting a level box. All too often they're crooked 'just enough' to be annoying. Especially when you get into 2 gang or more sizes. This only gets worse when the drywall crew gets sloppy...