Hi there,
At this moment, you can get a viewport preview using the UVM mode for the Tile shader (please be aware that you also need to set the material tag's projection mode to "UVW Mapping" mode).
This will be improved in future versions, but for now, this is how you can get a viewport preview for the Tile shader in C4D.
I hope this helps.
Please let us know the outcome or if you need further assistance.
Have an amazing day/evening.