You would have to make some custom-made rubber mounting pads to compensate for the sharper angle of the cowl sides than on passenger cars. Without something to compensate for the angle difference, the lights would end up looking cross eyed. '32 cowl lamps with 3-window pads might work as the cowl angle on deluxe coupes is sharper than on the other '32 passenger cars and that is compensated for in the pads.
There are no reinforcement in the cowl for the lamps, unlike on passenger cars and commercial vehicles with their doors hinged at their rear sides.
Or use Model A cowl lamps as in the photos above.