Here is a goal: How to check level with containers on wood plank.

How would you accomplish this goal?

Select from: [i] Using a level, place it on the corner of the plank with the containers a few inches apart. If it is showing it is leveled, then leave, if it is not then adjust plank.. [ii] Using a level, place it on the middle of the plank with the containers a few inches apart. If it is showing it is leveled, then leave, if it is not then adjust plank..
[ii]