Sure this isn't rocket science but might be of help to some. .
A cheap and good solution for jacking up the zed on the approved jacking points on the sills , you need a special shaped pad here so you don't damage the pinch weld on the sill .
You can buy solid rubber hockey pucks on eBay for just a few pounds each
Cut a channel down the middle with an angle grinder , a grinding disc works fine , the groove you need is about 5mm deep but just keep trial fitting until the puck fits flush each side of the seam .
Job done , you can use these with any type of jack and they are especially useful with axle stands, the rubber surface helps stop the stand from slipping
Usual caveats apply , be very careful when working under your car and you do so at your own risk