They wouldn't really. They aren't like Ozzy Osbourne's bodyguards surrounding them and looking angrily at passers by. They spread out and are forward looking.Ok.. thanks...That seems pretty excessive... But you may be right... I looked but couldn't find any numbers.... Not sure why they would need 4 or 5 around at any one time, though...
As for why you couldn't find numbers it is because security is something that sunshine laws allow to remain secret. The numbers they have around each person would reflect the danger that the Secret Service believes they are under and what kind of activities they do.
Like Trump golfing often in open spaces... He'll take more than Ashley who likely rarely stands in open spaces for long periods riding around in open electric vehicles.