Nice -> Cannes Ubers with child seats? Or alternatives?

Hi, we are travelling with a 3 year old and a 6 year old and 2 large suitcases next summer.

I wanted to use Ubers or Taxis for the door to door service. Is there any provision for 2 x child seats in any kind of booked vehicle?

We will need transport :

1. from Nice Airport to AirBNB (on the Promenade des Anglais)

2. then from Nice AirBNB to Cannes AirBNB (la Croisette)

3. then from Cannes AirBNB to Cannes train station.

What methods are available that will cater for child seats? I know we could bus is we had to, but with 2 children, 2 large suitcases and a pram i'd rather avoid...

Thanks,
Mark.