3 AMP+Pis...with one PSU - but which one?

I now have three Pis with HiFiBerry Amp+'s all running Moode for multi room audio. To tidy the installation up, i'm putting them into a wall mounted box. I'd like to keep it simple, so was thinking about replacing the 3 power bricks with one!

Am i right in thinking as i have 3x50W=150W, i'd need:
12v >=12.5A (150/12) powersupply  
18v >=8.4A powersupply 

and if so any suggestions? ...or is this a bad idea for any reason?

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