The great news is you don't need Uber because if you download the G7 official Paris taxi app, (which operates just like the uber app in all the ways uber does) you will have a clean/pristine professional taxi and driver at your every whim. The only place you don't need to use it is at the CDG airport. There you go directly to the official taxi stand line, (ignoring anyone who tries to temp you to go with them while walking to the line) and get your taxi that way. Also, official taxis can use the bus lanes making them get you places quicker.
It was absolutely the best experience when we were there in April. We used it from day one, but when my husband injured his foot midway through our trip we G7'd our way all over the city. For every ride, the cars were like hiring a private car service. We only were 2 passengers, but you can put in 4 in the app. Play around with it now, just to check it out and see. We saw a nice taxi/van pick up a family at one of the restaurants we were in; and every car we were in, could have probably done 3 in the back, and 1 in front even if it's the least desirable.
Enjoy!