Manage 2 amplifier and 2/4 speakers

Hello,
I have two AV amplifiers that I’d like to use for stereo with my four speakers. I’m wondering if this simple setup (as in the image) could be improved, especially when I decide to use it in a double amp configuration with two speakers. In this case, I must ensure that the two amplifiers are in the off state. Furthermore, I need a simple solution to implement what I want. I believe a good starting point is to use the AC power outlets at the rear of the ampflifiers. In fact, when the amplifiers are turned on, I can measure 230V AC at the outlets, and when they are off, I get 0 V.
Any ideas?
 

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