Your post is a bit unclear with what you mean "powering up", but if you mean the remote turn on signal for the ZLD and amps then the toggle switch should work well. The remote turn-on signal is a minimal current draw and that switch most likely can handle at least 10 amps of current. It will just carry 12VDC to the remote turn-on for each device. Just get your 12VDC from the same source as the amps/ZLD to keep ground loo issues to a minimum. The B+ and B- for the ZLD you should be able to reuse from the HU wiring.
Now if you mean the main power for amps and ZLD then a toggle switch isn't your answer.
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