Currently, they can be used via FXpansion VST-RTAS adapter only. We plan to support RTAS by our plug-ins directly in the future, but this is not of priority to us. TDM will not be supported by our plug-ins.
Make sure you are looking for the plug-in in the right menu: the plug-in will show up in the Inserts menu in Pro Tools' Mixer screen, not in the AudioSuite menu. If you need to use the plug-in in mono you can manually set the "canMono" option to "Yes" in the wrapper.