There is the "Car lanes" template in Construct that is pretty much the basic of what you asked, moving cars in straight lines :
editor.construct.net
Also, in Construct, the angle 0 is facing to the right.
So indeed, with a car "looking" to the right, to make it face to the bottom of the screen, you have to set its angle (or since you might be using the Bullet behavior, set its motion angle) to 90.
So to pin a text object, position the text object where you want it to be (let's say car.x and car.y - 64 for example, to have it at the same X as the car but on top) and when you pin the text, use the "position only" option in the dropdown.
construct.net/en/make-games/manuals/construct-3/behavior-reference/pin