I’d get a 3 ton floor jack. I have a 1.5 ton, it’s a heavy car, though, so I’m not convinced mine is up to the job.
The service center will have jacks made to fit the jacking site on the car. A home jack won’t fit. Since the battery pack extends lower than the jack point on the car, you have to make sure you don’t crush part of the battery pack trying to jack up the car. I’d use the adapters you bought. I do understand the service center doesn’t use those jack pads. Anyone else isn’t going to have the special jack that fits so the pad will give you a jacking platform lower than your battery so prevent you from damaging the battery pack.
Assuming you have a standard floor jack, what did they suggest during your tutorial so you crush that expensive battery pack?
Since you asked, here's a bit more detail. I hope you and others find it helpful.
When I first showed up at the service center asking for instruction on how to change a tire they took a look at the jack I'd planned on using and said it would not work. They suggested a different one so I returned the one I had and bought the one they recommenced.
Then back to the service center and we went out in the parking lot and they used the new jack and various other assorted tools I'd purchased and proceeded to show me how it's done.
Note in the attached images the parts include:
Chocks to keep the vehicle from rolling when jacked.
Poncho for changing tire in the rain.
Shop rags for dirty hands (now think I should include work gloves).
LED flashlight.
12 VDC air compressor.
Tire patch kit.
Toilet paper (oh, that's for something else...
)
A breaker bar to loosen the lug nuts.
A torque wrench to tighten the lug nuts the recommended amount.
And, of course the jack, rated at 2 tons.
Small tool kit.
Personal locator beacon.
Oh, and a fire extinguisher for use on unfortunate ICE vehicles.
Note that the head of the jack is not smooth. The "teeth" are designed to bite into the rubber areas under the car where the jack is to be placed. It is also the right diameter so that it only pushes on the rubber area and nothing else so there is no damage to the battery pack or the car's frame.
Another picture also shows the spare tire in the trunk. It takes up a lot of space but I live with it since in three years of ownership I've had 3 flat tires (I had 27 years on my previous vehicle and only one flat in that whole time).
I'm happy to answer any additional questions.