Progresses on autonomous vehicles suggest a future where they will share urban environments with fragile road users such as pedestrians, cyclists and two wheelers. In this article, we focus on the visual external Human-Machine Interface (eHMI) of autonomous vehicles used while interacting with pedestrians, and more particularly on its placement to increase its relevance and, thus, the safety. We conducted various experiments including 3D simulations to highlight which parts of the (autonomous) vehicles are most prominent in the pedestrian field of view in a scenario where pedestrians cross the road in front of a 3-vehicles row. Our results show that the placement of visual feedback on the front of the vehicle is optimal only if the vehicle is the first one. In other cases, the visibility from the front decreases with the position of the vehicle in the lane. On average on all our simulations, one coarsely can say that the visible parts of the vehicle are 2/3 on the side and 1/3 on the front. In future work, based on this result, we will use the prototype depicted in this article to evaluate the relevance of lateral animations on an autonomous vehicle to communicate its intents to road users.