If I were tackling this job and no suitable equivalent was available for testing, I would do the following:
Fix some material to the board in two seperate areas that will not be engraved (preferably opposite corners), in a stable but non-permanent way (using double-sided tape, etc.)
Engrave a cross-hair onto each of the two pieces of material.
The above will allow you to use Print & Cut to re-align artwork if the board is moved. This method should not be relied upon, but it is the best backup available and has saved me a few times in the past.
Next, start engraving gradually with conservative settings, one pass at a time, ensuring the board is not moved when inspecting the results. You can always run another pass, but you can’t take one away!