Super low chance of getting banned on account that has never been botted, I have the same mule I've had for the past year, not a single ban and level 3 lol
You can bot agility, I've botted agility on multiple accounts but you just have to be extra careful. 80 on my main and 66 on my pure, graceful on both.
One account? You can do more than one account at a time but not too many in a short amount of time which I don't know how many or how long, but definitely more than one.