Hi @sumanregmi45 ,
We do not have information on how to set up Eero Mesh or recommend any specific brand. But we can provide basic settings on how to set up 3rd party / extension routers also we suggest to check on google best router extension that will fit the environment of the house.
I don't understand too much of technical things. But I have read that Eero doesn't support VLAN tagging and PPoE and have to be tweaked somehow to be used with TPG and other ISPs like iiNet. So, I just wanted to make sure what are these things and what tweak has to be done to use Eero? Thanks.