Yes, aimbot aims on heads too, depend of how you set him up.
Yes, buying of the GTA cheats you will get access to 3 versions, to normal GTA, FiveM and RageMP, in this case, you don't need premium package, normal GTA will be enough.l
Keep in mind that FiveM is currently under update. https://www.systemcheats.net/forum/status.php