Hello!  I'm spec'ing out a replacement wifi setup for a club. There is a metal building on the site, and then we want to cover as much of the outdoors areas as possible.Currently I have an older Ubiquiti donated system with the base router by the cable modem in the center of the building (with a couple hardwire things plugged in as well) and then the satellite units right by the exterior walls inside and plugged in.  It works pretty well but it's getting old and ideally we'd like to expand the outdoor coverage eventually. 

So I'm looking at a AXE5400 (Deco XE75) for the indoor unit (I have a couple things that have to plug in hardwire) and then two AX3000/Deco X50-Outdoor units just outside the metal building.  

I assume these units work together?  Speed isn't a huge concern (they are paying for a very slow old service anyway), I'm mostly just concerned about coverage and reliability. 

Does anyone see any issues with this?   

Thanks!

John