kitchen - lining up base units with wall units

[benpost]

my wall units are in place with a splashback and chimney extractor. i'm here to ask the best way of lining up the base units with the wall units. the problem is that the worktop and upstand are already in place so i cant just draw a straight line down from the wall cabinets. what would be the best way of finding the correct position of the base units, such as the oven housing which is meant to go straight below the hob and extractor?

[Dave Liquorice]

Plum line down to the work top and your eye?

Laser level set to "line" and aligned with plumb line?

[Schrodinger's cat]

Plumb line?

[The Medway Handyman]

Spirit level or plumb line.

[benpost]

the problem is the worktop is in place with an upstand so i cant continue a line from above the worktop to below it??

i could use the wall as reference which is 1.1m away and measure above the worktop to the splashback edge then the same distance from the wall to below the worktop?

[auctions]

2 person job:

Hold a framing square against the wall units in line with an edge. Hang a plumb bob down in line with the front of the worktop.

A