There are a few free Grid extensions on the Extension Warehouse, if you really want to pursue that route. They generate a parameterised array of construction line gridlines spaced as you specify, collected into a component (or maybe group - it’s a good while since I used one and I can’t remember).
See for example https://extensions.sketchup.com/extension/a784fd64-f0ae-492b-8ca4-06aaec6afec6/grid-tool, or just search the warehouse for Grid.
And always pick a clear point on your component (or group) when you start to place it - by default, a component takes the bottom left corner of object’s bounding box as its origin, and places it with that as the reference point when you drag one out of the Component Browser. For rounded or circular objects, it’s sometimes better or more useful to define the bottom centre, or even the 3D centroid, as the origin.
However, although you will by default place the component or group using its origin, you can always pick some other well defined place - a corner, say, or the midpoint of an edge in the object - as the point to place.
Note: IIRC in earlier versions of SU, if you dragged a component out of the browser a second time, its pick point repeated the position from which you last moved it. I seem to recollect that this changed in later versions, and it is now the origin.