Powering multiple HifiBerry AMP2's and speakers

I'm looking to create a 6 zone audio system (possibly up to 8) with individual pi's each with the the HifiBerry Amp2. I have a central server rack, so for ease, wanted to have all the Pi's there and just run the speaker wires to the speakers around the house.

Rather than having 6-8 power supplies, i'd like to hook them all up to one supply. So if i had 8 all running the max (unlikely) i would need 480w at 18v, so would something like this be the best option: https://uk.rs-online.com/web/p/embedded-switch-mode-power-supplies-smps/1720764

Also, would the 2gb Pi 4 Model B be sufficient?

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