RAXE500 to EAX 15 Extender using same address as the router, possible?

I’d like to push WIFI to an upstairs room. Will this device:

EAX 15

Can this device connect to the RAX500 so that the extender will use the same addresses as the router?

I see a reference to this ability in the installation instructions for the EAX15 however that extender has “Mesh” in its title and I don’t see anything in the instructions that says the main router has to also be called Mesh. I don’t think the RAXE is a mesh router. This was a pretty expensive router so I won’t be replacing anytime soon as long as it keeps working.

If this post belongs somewhere else I’ll gladly delete and repost in the right place.

Thanks,

Pete D