Well this tracker does tick most of my boxes as I do like that it can leverage off both the iPhone and Android tracking networks, and that it also has separation alerts. The replaceable battery, with 12 months expected life, is also a plus.
The dual network support is important as it prevents any vendor lock-in if you decide to change your phone ecosystem (which I’ve done more than once).
It however does not seem to support UWB (Ultra-Wideband) to show the distance and direction from the tracker for closer range finding. It can though activate an audio alert on the tracker when nearby to assist with finding it.
See https://www.howtogeek.com/chipolo-pop-tracker-iphone-android