The jack has a fitment specifically designed to fit an attached reinforced point in the sill.
Why would you want to use alternatives not designed for purpose?
These are heavy cars and I other than the correct jack, i would not trust anything other than a 3t trolley jack which would be a lump to carry round.
Even using trolley jack I also use axle stands.
I really do advocate getting the correct tools.
https://www.ebay.co.uk/itm/155022562...media=MOREJohn l