Shelly 3EM in central fuse box, using same phases for power supply?

Hi Shelly Support community

I am a new member of this community and I am excited to learn from all of you.

We are multiple houses, but will install 3EM devices in a central fuse box with limited space.

Although it's recommended to use the same phases for the Shelly 3EM, my project manager wants to use the phases of one house to power all devices, claiming measurements would still be accurate enough. I'm unsure about this approach and need help with argumentation to discuss the potential issues with using different phases.

Your input will be valuable in understanding the potential drawbacks or inaccuracies in this setup.

Thanks a lot in advance!

Thanks a lot for the quick and clear reply!

That means we can process with only one fuse, will make the installation a lot easier...

To be 100% clear, I made a drawing of what we planned, hope this is correct.