HI all happy new year

I have a hobbymat MD65 that ive never bolted down its only been used for non dimension work. Ive been bitten by the bug i need to bolt it down and start to make some toys and tools
My trouble is the hobbymat has 3 mounts 1 either end on the closest side to the operator and 1 in the middle of the bed on the back. how would you approach leveling this?
Im looking forward to some ideas
James