None work "great" and no 5G options for US.
The LTE6 will work okay with AT&T, albeit 5G and limited to CAT6 speeds - but it does at least couple CA modes for AT&T. And LTE6 may work for Verizon, in some areas, but it's without Verizon's Band 13 – which VZW widely deployed/uses – there be no CA.
The only option is the Chateau LTE6-US. That does have Verizon's Band 13 – unlikely the other LTE6 models. Now... while it has the bands for Verizon, you will very likely not be able to use IMEI for the Chateau to enable Verizon SIM – so for Verizon you'd have to active the SIM using another device, and then move the SIM to Chateau (and same for other Mikrotik LTE6 devices too). None are "certified" by Verizon, so they won't enable any Mikrotik modem. But if you put a working SIM into an LTE6, it's likely work for Verizon but still limited. And, LTE6 models don't use LTE Band 66 or Band 30, which are pretty common these days for AT&T/Verizon, why I say "none work great".
You can check the bands an area using cellmapper.com & compare those with Mikrotik's offerings. But basically any of the LTE12 or LTE16 or 5G models will not work in the US.
Thank you for the detailed answer.
I remember reading this quite a while ago. I supposed I was hoping the situation had changed.
I am not inclined to buy a Chateau LTE6-US knowing I will have to register the sim card in a different device and then hope is works and continues to work.