"Combining" rectangles for laser engraving


There is probably a quick way to do this but I can't find one.

I set up rectangles for engraved plaques with text in, such as this

Now this means there are overlapping rectangles which means the engraver cuts the same line twice.

I'd like to preferably have it only cut once. Combining doesn't fix this, gives the same result.

I can't remember what I've tried with the Shaping tool but I didn't have luck there so far but I may have used the wrong settings.