I have an E!. center stop is normal, slight rubbing of pads is ok, but only slight also very little bend on the rotor, and thus rubbing the pads, is ok too,, now more than slightly bent rotor, unfortunately happens often, out of the box, but it also happens during rides\falls,
There is a special tool on sale to bent them back, they are also easy to replace, not expensive, 140mm is the right size, but some say 145 will work too. just be careful with rotor screws, you will have to deal with them anyway when replacing tires/fixing flats. they can cause a lot of pain, when they strip, and they do strip often, however if you inspect clean the bolt, and insert the key key all the way and press on it when turning, you will brake it lose and unscrew without any damage. same with rim bolts. /just do not use the tool it comes with, you wil definately strip the bolt, throw it away now, lol. Do not over tighten screws, aluminum is a soft metal, if you strip the motor housing threads, you’ll have to either do very complex procedure of fixing the threads, or buy a whole new motor.