It’s not that tricky.
If you don’t know where you are you can have a roll call type radio message that all anchors in range reply to.
Or you can have a pre-defined list of geographically diverse anchors such that one of them will be in range anywhere in the area. That first round may only give you one anchor but that will give you an approximate area. A second round of ranging centred in that area will get you more anchors and an approximate location. By the 3rd round of ranging you’re probably on the optimal set of anchors.
The second method with a few refinements is how our system works. We have installs that are over 400m long, you can power up anywhere in the area and from the radio first starting to using the final set of anchors for the current location takes around 20 ms.
None of this is new, complex or difficult to implement. And it’s a lot cheaper than adding extra hardware and the server side infrastructure that a second radio would require.
Our system consists of the anchors and the tags, no extra computers or equipment needed when running (some needed for setup to survey & configure) . All the anchors and tags require is power, no extra cables or connections other than the position output feed from the tag.