Man, I had enough trouble fittimg one BT 2180 with the BT bracket under the fairing of my 2015. I don't know how you would fit 2 under there without some serious mods, cutting, and fabrication.
I read your other post about the cubby holes. There's not much room in those at all. If I was going to try and do all this, I think I'd mount the amps in the tour pak if you have one.
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2015 Denim Black RG, FM ss ceramic coated 2-1-2 pipe, White Bros Original E Series Mufflers, FM ac, PV Tuner