Normally they are on top of the pits but looking at the pics they were from the new stand across the pitlane. Probably a Monaco specialty based on limited space
Correct. In addition they allow easy access to Paddock Club for those tired of seating in the heat too long and wishing to take a break with Champagne and snacks. Drivers mobile homes (they really look like permanent,very modern structures with nothing "mobile" about them) are right next to Club.