2 zigbee Coordinator's

I got conbee
and I thing adding this zigbee for the basement, do you think both can work parallel,
won’t make any problems ?

What for? If you have connectivity issues, add more devices on mains.

the basement is in the garden and far away everything down there disconnects all the time I thought that would be a solution

Zigbee is a mesh network. The more powered repeaters you add the stronger the mesh becomes and the better the comms are.

Adding a second coordinator would mean adding a second zigbee network which may end up causing more interference than it helps. You’re better off understanding the range issues and fill in with line powered devices that also act as repeaters…

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Yes, on my practice - two networks can acts together, like two wifi networks.
Set different channels for them.
Confirmed by many installations.
No interferences were detected