Mike be very, very, careful about mixing OC & cars until you get your MI CPL .
Be advised that (some) police in MI (Metro Detroit) watch this board like hawks waiting for any scrap of info to try and jam up OCers. I know your employer allows you to carry, but should you be asked to run for a part, or even move a car into the street to free up parking/garage space always remember to disarm.
Before I had my CPL in MI I would carry 3 mags two in a mag holster and one in a pocket. When I got out of the car, I
always made sure to take the pistol case completely out of the vehicle. Place it on the ground or other area not touching the car/truck/van etc. Then load the pocket mag making sure to keep safety in mind. Reverse process on departure and be sure to eject the chambered round.
This is dance is necessary, as the law has been twisted by the prosecutors/courts in MI so badly, that LE considers the bumper/tailgate/trunk/hood or roof of your vehicle, as the same as you being inside it with a pistol - hence concealing your pistol, should you have possession of it in a non transport mode (out of case) while in contact with your vehicle.:uhoh:
Be careful and please study, study & study some more before you end up in trouble. Myself, Bikenut,Venator, Michigander, DrTodd, Autosurgeon, etc.. (too many good guys here to list) are all good guys and will try to help you get started; just send a PM and most of the time you will get a prompt answer from us.
On topic I have carried cross draw. If you stay with this style of carry make sure to train drawing with your weak hand too. This goes for any style, but drawing off hand in a crossdraw setup requires a slightly different wrist motion.