Netgear Orbi AX6000 and adding a Nighthawk AX12 (AX6000)

[fluxis]

I have a Nighthawk AX12 (AX6000) right now and its not quite giving me the range I need in my house. 

I am looking to buy a Orbi AX6000 2-pack but instead of just selling the AX12 I have now I was hoping to use it in the mesh.

Is there a good way of doing this that won't cause more harm then benefit?

Maybe its just better to buy another AX12 and create a mesh out of that?

[FURRYe38]

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

What is the size of your home? Sq Ft?
30 feet or more is recommended in between RBR and RBS to begin with depending upon building materials when wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite

[fluxis]

Not sure on the model number for my ONT but its Verizon Fios gigabit.

I have a ~2400 sq ft home but the problem really is its a townhome as is 3 floors so the plan is basically a single device per floor.

[FURRYe38]

Would be something you may want to try with the Orbi AX system, find a place that has a good refund policy and take one for a demo ride and see how it works for you.