Uh, I think
F87source might have thought you said 30 months.
Look, 3-4 months, you don't need to go crazy - heck there are people here that don't even put it on a charger for that long.
But..for me, a guy who parks his 1M for 6 months at a time...besides the CTEK...
1. A Car cover is the best thing you can have for a car that you are storing.
2. If you want, you can over inflate your tires - not the worst idea, and yet, any flat spots you might get in 3 months are gone in the first drive.
3. No need to change fluids unless the car is due for them
4. Fuel stabilizer is optional - however, you would add it to a FULL tank and drive the car for a bit. I seem to remember, that's not an option for you.
5. As noted above, a FULL fuel tank is great to help keep the moisture out, but if you can't, don't worry about it.
6. You can leave it in gear and you can put the parking brake on it
I think people forget that these cars can and often do, sit on dealer lots for months. They are amazing - and unless you are storing it for a year or so, you really don't have to over think it. Based on your condition, just put the charger on it and then drive it when you are all better. And seriously, just connect the charger to the charge point in the engine bay (red capped point) and the ground that you have already found. You can still close the hood - no need to permanently wire it.
CRAP! I forgot #7! If you don't have a loan on the car, turn the insurance off (the collision). That will save you some money and see #8
#8 put a note on the steering wheel (charger connected, put insurance back on) - it is easy to forget that you have the car on a charger and even easier to forget that you shut the insurance off.