Use as mesh APs with Unifi Router?

I don't have access to the web version of the app and I want to be in more control of my internet. My ISP says I can use a different router if I want. I currently have three pods connected together via ethernet and switch and my WAN coming into one to act as a router. Can I get a unifi router (probably the Cloud Gateway Ultra) and use the existing pods as a mesh AP network?
I would like to eventually upgrade to full unifi but no point in swapping if the existing pods will work.