@BGary 

Hi, welcome to the community.

For the AX6000, do you mean Archer AX6000?

Have you purchased these two devices already?

If hasn't, I wish you could only go for Deco.

What are the Differences between Deco Mesh, One Mesh, Easy Mesh and Omada Mesh?

But If you have bought them already, it is suggested to use Archer AX6000 as the main Deco and set Deco XE75 as the Access Point mode.

Then since they used different Mesh technology, I think you could try to disable the wireless network of AX6000 since XE75 supports WiFi 6E(an additional 6GHz wireless band).

Thank you very much and best regards.