When I want to create the impression of multiple pieces of wood glued together, I divide the face with lines so I can edit the position of the wood grain image on each face independently of the others. Then I hide the edges between faces. You can see that on shelf of this table.
And also on the parts of these red oak stools.
I make wood grain materials from whole boards. Typically they are 8 to 12 feet long. Often I’ll make between three and six textures from the same log. This allows me to pick different parts of different boards so there’s not a lot of obvious grain repetition as you’d get in those wood images from that site.