It's the PLS8.
You can download the data sheet and have a look but basically yes, T-Mobile will be supported, at least physically it supports the right channels; there could be something weird that prevents it but I'm pretty confident.
Just fyi, the pls8-us does band 17 which is a subset of band 12. This does not include the new LTE 700 Mhz block A that is the majority of the new T-Mobile LTE network as far as I can tell. It does support the older bands though, so that's good.