Car Jack questions

KWZ

Hey guys, I am about ready to do my first oil change on the Z and change over from summer rims & tires to winters. Anyways I would like to get some feedback on the following pinch weld jack adapter which I know a lot of guys are using. How well does it fit onto the Z's pinch weld's? It looks like the pinch weld may not even contact the bottom of the groove. Is this safe? Do they have a flat bottom? I understand the 1006 size but what do they mean "to fit outside 2-7/8" to 3-1/4" " for the 1007 size? I was looking at the pinch welds yesterday and they don't seem very thick.

Protech pinch weld jack adapter sold by Pure Motorsport ...

Performance Parts & Repair Specialists for Audi, Porsche and VW - PURE Motorsport

I have already purchased the following jack stands. If you zoom into the picture you can see that they have a notch to accommodate the pinch weld and there is a rubber saddle at the top. Will these be okay to place under the pinch welds?

2 Ton axle stands ...

Michelin Premium Axle Stands | Canadian Tire

I am considering purchasing the following Michelin 2-ton Low Profile/High-Lift Service jack ...

Michelin 2-ton Low Profile/High-Lift Service Jack | Canadian Tire

I would like to be able to access all 4 jacking points (front, rear, sides). For the front, I'd probably have to drive up on some wood pieces first.