Conduit from head end to first shade in the room. Conduit from 1st shade to 2nd, from 2nd to 3rd so on and so forth. Conduit from last shade to the head end. This is the only way to cover you for every manufacturer. And keep in mind that the conduit needs to be large enough to get home runs to each shade in the room if you end up with a system that requires it.

Or have them choose a shade manufacturer and save a lot of money and time.

Then think about shade pocket design so that they build them in as they install the windows.