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I press fit the 18" x 25" x 2" foam into a wooden frame slightly smaller than the foam . The foam is typically 17 15/16" x 24 15/16" x 1 15/16". I therefore build the frames from 1" x 3" select pines with an inside dimension of 17 7/8" x 24 7/8". The foam would then press fit nicely into the frame. By using 1" x 3" select pine you create a 1/2" air gap on the back which improves the performance of the panel. I cover the front with acoustic foam from Guildford of Maine. I mount the frame using an L bracket on the frame and a Z strip on the wall.
I cut French cleats and they work really well and you can add material, equal in size to the mounted cleat and behind it, to gain air gap depth if needed. They are difficult working in tight spaces though, like between studs and you have to be very aware of your top clearing height as well because it needs to lift up in order for the cleat to sit paired.
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