Do power optimizers need to be fitted to every panel to see the benefit?

Do power optimizers need to be fitted to every panel to see the benefit?

I have an install with 3 panels that get about 10% to 20% shading from 7pm to 9pm due to an adjacent roof line being slightly higher.

Installer has recommended optimizers for those three panels so they don't bring down the efficiency of the entire array for those 2 hours. I assumed I would need them for every panel for them to be effective though? Is this the case or can they isolate sections of the array individually and leave the other 9 as normal?

In my case I have 12 335 watt panels with 3 that would need optimizers supposedly.

submitted by /u/oliverofthepeople
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