.. you can mix and match other Deco stations to expand your coverage.

For example.. I have the basic Costco AXE5300 3-pack.

Den: Covers all of my exterior lights and the front of the house.
Great Room: Covers the middle of the house and our Master bedroom.
Laundry: Covers the back of the house and our patio & deck.

Then I've added 2 more XE75's.

Upstairs Loft: Covers the upstairs bedrooms
Downstairs Family: Covers the downstairs family area.

I also have them all going through a wired/ethernet backhaul (but they work fine if you don't do a wired backhaul).

Its over kill.. but i also have crazy fast WiFi in every corner of my house (at a cheaper cost than my old crappy Orbi unit).