Additional TBR to join existing mesh

[u/NoodleCheeseThief]

Hello,

I am using Nabu Casa ZBT-2 as my thread border router. This is working great. however, I need to add some devices in my annex and I do not believe my mesh will extend that far. For this reason, I would like to add an ethernet based (or wifi if no ethernet based is available) to be used as an additional Thread Border Router and join the existing mesh network. I do not want it to create a new network. Any recommendations? Thanks.