All analog FM cans have near-zero latency. Once you go digital, most will have more than 5 msec latency. The ones in the 2.2 and 2.4 GHz band will have more than 10 msec latency.
I don't know if any of the analog cans are usable for mixing.
I put "extremely organized" on my résumé and I don't even remember what folder I saved it in..