I used to have DSL modem ethernet connect to my phone modem inside, now the fiber router is in garage, could I use mesh Ethernet connect to the phone modem ，, the main point connect the router in garage, the 2nd mesh point connect to phone modem?
Thanks for posting your question here about your proposed network setup. Are you looking to create two separate networks entirely, or are you looking to create a single network with two modems involved? Two separate networks with separate SSIDs would be possible, but creating a single network with two modems involved would create some issues for you.
If it's something different you're looking to do and I'm misunderstanding, please clarify and we'll keep looking at this.