Unfortunately, we don't have default electrodes positions in MNI space for these EEG caps.
Could you contact the ANT customer support to ask them if they could share this with you?
If you can get a file with 3D positions (in any coordinate system), please send it to me, I will add it to the Brainstorm distribution.
Otherwise, you can use Brainstorm to place all the electrodes manually on the surface of the head, maybe starting from a template (right-click on the channel file > MRI registration > Edit)...